I have been searching for such good videos as I started my CAT preparations but couldn't find any. You are doing an absolutely amazing job sir, I really like the videos. All the concepts are beautifully explained in simple language and simplified ways. I wish u all the best and thank you a lot.
I have been searching for such good videos since I started my preparation but couldn't find any. You are doing absolutely amazing job sir, I really liked your videos......Rest is good
Anyone here who did not take any classes but ravi sir's youtube lessons & got a 90%+ ? if yes please comment down & let me know Ps: I appreciate what ravi sir is doing for everyone
FOR THOSE WHO ARE USING 50X30X10 FIRST AND GETTING TOTAL CUBES = 27. here the question is "find the min. no. of cubes" which means we have to take size of the max. and for max. size you have to take each side "as close as possible".i.e. 40x30x20=2400 and not 50x30x10=1500.
simple way to keep in mind is to know that large area of 50*50*10 will be wasted with 10*10*10 and give too many cubes, we should use small area of 40*30*10 .
thank you so much sir for giving us cat resources for free It means a lot to us about how we cannot afford coaching for cat preparation. and you are providing us free cat lecture videos you are amazing sir thank you so much once again. 🙏
every thing was crystal clear except one thing,,,you didn't explain why in the 2nd step you took 10*30*30 as a piece to divide further and why not 50*10*30 as a piece to divide further,,,cause both of them would give different answers,,1st one which you took gave 20 as minimum number of cubes,,but if you take the second dimension,,it will give 27 cubes,,subtle but important point,,if people start dividing the wrong slide in 2nd step,,they will get lost and will end up with wrong answer even after such lengthy efforts being put into it
For those who are wondering which of the 2 cuboids to select at step 2. This is the approach you can follow - At step 2 we can have 2 cases i.e. case 1 - 40*30*20 & 30*30*10 or Case 2 - 50*30*10 & 30*30*20. As the question asks for minimum no. of cubes, at every step, we have to get max size of cubes. For case 1 - max size cube is of 20 and we get 2 such cubes (40*30*20/20*20*20); whereas for 2nd case, max size of cube that we get is again 20 but we only get 1 such cube (30*30*20/20*20*20). Hence we choose case 1. Also to find max no of cubes that you can form from a cuboid just find the quotient for length, breadth & height separately and then multiply. for e.g. 40*30*20/20*20*20 = quotient of (40/20) * quotient of 30/20 * quotient of 20/20 = 2 * 1 * 1 = 2.
Sir I think we can make the answer more simpler By just taking the difference between of the highest number (50) and the lowest number (30) that can also give the answer. Like (50*40*30) = (50-30 =20) or (50-40= 10.. 40-30= 10 then later 10+10= 20) Please guide me sir if it's a unethical solution to the answer
after cutting the 30X30X30 cube how to select which remaining cuboid to take first ? i took the 10X30X50 cuboid (front cuboid)first and cut it in 15 10X10X10 cubes, proceeding further in this way i got more than a total of 20 cubes . how to determine which remaining cuboid to operate first . ?
@Aakash Nihalani no by taking 50x30x10 cuboid in 2nd step we get 15 cubes of 10x10x10 then next cuboid is 30x20x20 we get 1 from it and next 2 remaining cuboids are 20x20x10 from which we get 4 and 30x20x10 from which we get 6 cubes of 10x10x10. Hence total no. Of cubes = 1+15+1+6+4=27 CUBES.
here the question is "find the min. no. of cubes" which means we have to take size of the max. and for max. size you have to take each side "as close as possible".i.e. 40x30x20=2400 and not 50x30x10=1500.
@@robust_singh agar seekhna nahi hai to ye video pe click hi kyu kiya?Yesb reasoning ka questions hai...ratta maara huwa class 9 ke sums nahi ki 2 book uthaye aur kar liye and Sir is a multiple times 99+percentile holder...who are you man?
by taking 50x30x10 cuboid in 2nd step we get 15 cubes of 10x10x10 then next cuboid is 30x20x20 we get 1 from it and next 2 remaining cuboids are 20x20x10 from which we get 4 and 30x20x10 from which we get 6 cubes of 10x10x10. Hence total no. Of cubes = 1+15+1+6+4=27 CUBES.
I religiously watch your tutorials, Sir. However, I have absolutely failed to understand this concept. By any chance could it be in any simplier forms?
just know that a knife only cuts left to right and up to down.....so you may think as you are cutting a cake if you are cutting left to right on a cake the cake's frosting layer is cut,and up to down is just how you cut the cake on ur birthday, u cut a small volume of the larger volume of the cake
In the second step we have 2 alternatives . 30*30*10 or 30*30*20. And the answer will be 27 if we take 2nd alternative. How to select from the 2 alternatives
Thanku Sir❤️for sharing these concepts.U r a great teacher❤️👌. I have a doubt.Answer to Q 15:20 how many cubes of 10*10*10 can be cut off? is 9 or 9+8=17?
Thanks Sir..!! :) Just one ques - In the exam however (if the ques is diff like suppose 70*50*20 cuboid)... do we need to draw the figure, visualize and then solve..? Is there any trick to solve it without drawing the figure..??
Hi, for this kind of questions you have to draw figure because u need to visualise this and reach till last step.. moreover this kind of questions are of recent LRDI level of CAT .. so make diagram and solve till last.
a cube is painted on all the six faces. it is cut into 210 smaller cubes. then match the following:... How many cubes have 2 face coloured and how many cubes have 1 face coloured?? How can we solve this if the given number is not a cube.. like 210.. plsssssss ans..
In step 2 instead of taking out 10x10x10 cubes, it is possible to take out 20x20x20 cubes also; also you had said that size of cube every time is should be maximum, so logically shouldn't we take 20x20x20 cubes out? ( btw that method doesn't gives 20 or less cubes, so is wrong in that sense!) But why?
That means we get 20*20*20, now we should check how many cubes we can take out from the cuboid, which is 2 cubes in total we can take out from the cuboid
Now there's still some volume left in the cuboid which is 40*20*10 which is another cuboid, therefore we should do the same process again until there's no volume left
Sir I customized this question and I made it 80×70×60 cm. What is the minimum number of cube that can I cut out from this? My answer is 58. Is it correct? Please help me 🙏🙂
I have been searching for such good videos as I started my CAT preparations but couldn't find any. You are doing an absolutely amazing job sir, I really like the videos. All the concepts are beautifully explained in simple language and simplified ways. I wish u all the best and thank you a lot.
I have been searching for such good videos since I started my preparation but couldn't find any. You are doing absolutely amazing job sir, I really liked your videos......Rest is good
Anyone here who did not take any classes but ravi sir's youtube lessons & got a 90%+ ? if yes please comment down & let me know
Ps: I appreciate what ravi sir is doing for everyone
FOR THOSE WHO ARE USING 50X30X10 FIRST AND GETTING TOTAL CUBES = 27.
here the question is "find the min. no. of cubes" which means we have to take size of the max.
and for max. size you have to take each side "as close as possible".i.e. 40x30x20=2400 and not 50x30x10=1500.
simple way to keep in mind is to know that large area of 50*50*10 will be wasted with 10*10*10 and give too many cubes, we should use small area of 40*30*10 .
i am getting the same bro
literally had exactly and only this doubt , thankyou for clarifying it
thank you so much sir for giving us cat resources for free It means a lot to us about how we cannot afford coaching for cat preparation. and you are providing us free cat lecture videos you are amazing sir thank you so much once again. 🙏
The Way You elaborate the concept are extremely insane sir .
Superb concept!
I'm gonna have to watch this video again 😅
But first I'll try doing it myself
I did that concept on my own after the first hint. Thank yo so much sir
good job sir , thank you for your effort you are putting in making these videos . helping the cat aspirants like a well wisher.
Sir is not teaching he is training our us.
Giving us skills. 🎉
shuru me mushkil laga jb a gya tb to mja a gyi , thanku🥳
This is ultimate concept Sir.. amazingly explained
Thanks
@@Rodha Sir, let me know if this is right?
size of cuboid | size of the cube
50 *40 * 30 | 30 *30 *30 = 1 cube
50 * 30 *10 | 10 *10 *10 = 15 cube
30 * 30 * 30 | 20 *20 *20 = 2 cube
20 * 20 * 10 | 10 * 10 *10 = 2 cube.
Total = 20 cubes
@@mayuripatil4922 I think in your fourth statement you will have only one cube of 20*20*20 and in fifth you will have 4 cubes of 10*10*10.
@@sheetaljain3569 i think there's error in 3rd cube.. when we divide 40*30*30/20*20*20=3 cubes..?!
but he explains 20??
@@mayuripatil4922 answer right but wrong concept, all answers from this concept is not right.
every thing was crystal clear except one thing,,,you didn't explain why in the 2nd step you took 10*30*30 as a piece to divide further and why not 50*10*30 as a piece to divide further,,,cause both of them would give different answers,,1st one which you took gave 20 as minimum number of cubes,,but if you take the second dimension,,it will give 27 cubes,,subtle but important point,,if people start dividing the wrong slide in 2nd step,,they will get lost and will end up with wrong answer even after such lengthy efforts being put into it
It's because you want to minimize the no of 10x10x10 cubes you make
Thank you sir God bless you more than you think and be with your family to protect from all problems and worry ...
Amen🙏
For those who are wondering which of the 2 cuboids to select at step 2. This is the approach you can follow - At step 2 we can have 2 cases i.e. case 1 - 40*30*20 & 30*30*10 or Case 2 - 50*30*10 & 30*30*20. As the question asks for minimum no. of cubes, at every step, we have to get max size of cubes. For case 1 - max size cube is of 20 and we get 2 such cubes (40*30*20/20*20*20); whereas for 2nd case, max size of cube that we get is again 20 but we only get 1 such cube (30*30*20/20*20*20). Hence we choose case 1.
Also to find max no of cubes that you can form from a cuboid just find the quotient for length, breadth & height separately and then multiply. for e.g. 40*30*20/20*20*20 = quotient of (40/20) * quotient of 30/20 * quotient of 20/20 = 2 * 1 * 1 = 2.
11:00 shortcut
Superb sir... really it's good content for cat exam preparation study...
And forget in between preparation and study...
Sir I think we can make the answer more simpler
By just taking the difference between of the highest number (50) and the lowest number (30) that can also give the answer. Like (50*40*30) = (50-30 =20) or (50-40= 10.. 40-30= 10 then later 10+10= 20) Please guide me sir if it's a unethical solution to the answer
What about a cuboid of 10*20*40?
16:11 summery
Such an advance brain opening set, thank you, I cant be grateful enough for this, best I can do is like, comment and click on ads :P
after cutting the 30X30X30 cube how to select which remaining cuboid to take first ? i took the 10X30X50 cuboid (front cuboid)first and cut it in 15 10X10X10 cubes, proceeding further in this way i got more than a total of 20 cubes . how to determine which remaining cuboid to operate first . ?
same
@Aakash Nihalani in third step my answer is coming 3cubes pls explain me how is it 2cubes
Same bro, i think we can get maximum number of cubes by taking 50x30x10 cuboid.
@Aakash Nihalani no by taking 50x30x10 cuboid in 2nd step we get 15 cubes of 10x10x10 then next cuboid is 30x20x20 we get 1 from it and next 2 remaining cuboids are 20x20x10 from which we get 4 and 30x20x10 from which we get 6 cubes of 10x10x10. Hence total no. Of cubes = 1+15+1+6+4=27 CUBES.
here the question is "find the min. no. of cubes" which means we have to take size of the max.
and for max. size you have to take each side "as close as possible".i.e. 40x30x20=2400 and not 50x30x10=1500.
Thank you, sir, an amazing concept with amazing explaination
lockdown me dimag me jung lag gya tha...yeh q krke aaj sab saaf hogya...hahahha
So true 😂
Thank u sir best method with good visualisation techniques and concept
this might be a dumb question but when they ask maximum number of cubes can we do 50x40x30/1x1x1 = 60000 cubes?
Sir but speed matters.. And if we keep slicing the Cuboid and keep writing sizes , it'll require a hell lot of time😑
Concept matters most. ;) In CAT this will be a LRDI set kind of and you have enough time to solve a LRDI set in CAT
@@raviprakash6021 ja pogo dekh wha concept batna
@@robust_singh Beta. He is faculty who is teaching in this video. You are nothing compared to his level of skills in DILR & Quant.
@@robust_singh agar seekhna nahi hai to ye video pe click hi kyu kiya?Yesb reasoning ka questions hai...ratta maara huwa class 9 ke sums nahi ki 2 book uthaye aur kar liye and Sir is a multiple times 99+percentile holder...who are you man?
by taking 50x30x10 cuboid in 2nd step we get 15 cubes of 10x10x10 then next cuboid is 30x20x20 we get 1 from it and next 2 remaining cuboids are 20x20x10 from which we get 4 and 30x20x10 from which we get 6 cubes of 10x10x10. Hence total no. Of cubes = 1+15+1+6+4=27 CUBES.
Question is Minimum no. of cubes.
@@Rodha oh correct sir👍
Sir, all these videos be applicable for cat 2020 as well right?
Sir everytime we have to make figure n check do u not have any shortcut
Exactly my question bcz we will not hve this much of time in paper this is useless 😞
thnx sir...amazingly explained
Thnkq Soo much sir. For making this kind of Content
Thanks a lot would be helpful for 2022
Can't thank Enough Sir😊🙏 Gratitude
I followed your quant and LRDI both you made so easy for me
I religiously watch your tutorials, Sir. However, I have absolutely failed to understand this concept. By any chance could it be in any simplier forms?
just know that a knife only cuts left to right and up to down.....so you may think as you are cutting a cake if you are cutting left to right on a cake the cake's frosting layer is cut,and up to down is just how you cut the cake on ur birthday, u cut a small volume of the larger volume of the cake
In the second step we have 2 alternatives . 30*30*10 or 30*30*20. And the answer will be 27 if we take 2nd alternative. How to select from the 2 alternatives
question is of minimum number of cubes
Thanku Sir❤️for sharing these concepts.U r a great teacher❤️👌.
I have a doubt.Answer to Q 15:20 how many cubes of 10*10*10 can be cut off? is 9 or 9+8=17?
its 17
It's 9
Because we are only cutting 10×10×10 cube from 30×30×10 cuboid
There is maximum size that's why... there is maximum number of cube then the ans will be 17
Such a wonderful teacher ❣
sir excellent concept and awesome teaching .Sir, where can i get practice question on this topic?any online offiline questionnaire available?
Can you please explain the 3 rd step...it will be 2 or 3
I have question tht this playlist is made 5 yr ago so on this topic of cubiod there is question in actual cat paper or not I ll prepare for 2025
Badi mushkil se samajh aaya but aagaya finally
@15.30 sor asked how many cubes of 10*10*10 can be cut out? I think it would be 9+8=17 not 9
very few videos of DI are covered in the playlist, add some more videos
ok sir..;)
Thank You So Much Sir for this fruitful session ❤️
such a trippy concept. i had to watch 2x
Thanks sir.. it’s a great help for people who are starting the cat preparations and need assistance
Really yar
After 1 cut how is there 30*30*10 after 1 cut,the length remaining should be 50-30=20
I am not able to understand this
🙂 likewise
What didn't you understand?
Me too 😭
Me too 😭
Me too 😭
Very good teaching!
What if we are asked for maximum number of cubes from the same dimension cuboid. Is it 6000 of 1 * 1* 1
I watch the ads too. The way you explain....
:) chat.whatsapp.com/ITLx1sb7WmN3W1aOeqRmAY
Join the above group. I slso teach live on Unacademy.
@@Rodhasir, your group is full now. What can I do? I want to join it.
@@Rodha want to join the whatsapp group but it is full now. can you suggest something here?
@@aditisurabhi6353 t.me/joinchat/OAvenRZrDGCU9K6ttShnKA
please join telegram group
thanku sir for your concept but where i practised these type of question
Thanks
Thank you so much for your concept sir
Thanks Sir..!! :)
Just one ques - In the exam however (if the ques is diff like suppose 70*50*20 cuboid)...
do we need to draw the figure, visualize and then solve..?
Is there any trick to solve it without drawing the figure..??
No.. for this kind of questions you have to draw the figure.. because normally it would be a good LRDI set in CAT.. It requires effort..
Hi, for this kind of questions you have to draw figure because u need to visualise this and reach till last step.. moreover this kind of questions are of recent LRDI level of CAT .. so make diagram and solve till last.
Is the Answer to ( 70* 50* 20) 14 cubes ?
@@rajatharry i think 28 plz tell me if I'm wrong
@@VINAYNR-br7hb I tried but am getting 14 only. Try once more bro
really a good concept of cuboid
thank you sir wonderful class
More lengty concept but good
Do you have any question bank for the purpose of GMAT
Frm where we can get the questions of this type
sir, where can I find these kinds of dififuculty questions ? could you please reply for this question?
Sir,in last how can the breadth be 40 remaining breadth is 10????????
Please suggest me a good book to practice these lrdi questions. pleasseee
sir is cube and cuboid important for cat 2022 ???
frankly, thank you!!
Amazing explanation
Great efforts. Thankyou so damn much!
This is suitable for gate exam.......
Thank you sir 🩷🙏🧿
Concepts well defined 👌👌👌👌👌
Thank you so much Sir💫
thankyou sir🙏
a cube is painted on all the six faces. it is cut into 210 smaller cubes. then match the following:... How many cubes have 2 face coloured and how many cubes have 1 face coloured??
How can we solve this if the given number is not a cube.. like 210.. plsssssss ans..
factorize it into 5×6×7 and then do it
Is the answer 94 for one face colored?
Logically it has to be a perfect cube right? And if the pieces are identical then all the sides of the cube should be cut into equal parts.
i don't understand that how 50*40*30 turns into 30*30*10..help me out
From the face of 40 if we cut out 30 remaining will be 10
I’m confused too
@@rishikkarastogi same here
sir not any shortcut for these types of questions
Thank you so much sir❤
Sir joo aap jiss type kae questions karva rahe hoo vaise hii aata hai naa....CAT Kae exam Mai...??
Amazing!
Can u suggest best books for cat preparation
Sit is there any further part of cubes
Thank you.
can this problem be solved using maxima minima?
Aisa question cat may aata hai kya?
what about the 20*20*10 cube left
In step 2 instead of taking out 10x10x10 cubes, it is possible to take out 20x20x20 cubes also; also you had said that size of cube every time is should be maximum, so logically shouldn't we take 20x20x20 cubes out? ( btw that method doesn't gives 20 or less cubes, so is wrong in that sense!) But why?
Bcz the length given is 10 cm only, you cannot take out 20 cm from 10 cm
@@ayushisrivastava8145in second step how is there 30*30*10 because after cutting 30 cm from 50 cm there should be only a length of 20 cm remaining
@@sudhanshushekhar4710broo cut out was taken not the whole length .... length toh saari sides similar rahegi naaa
@@raghavendraram7461arey to cut out liya hai 30 kaat ke bahar Kiya toh bachna toh 20 chahiye na ?
Awesome♥️
Do cube questions come in CAT nowadays?
We cannot decide ;)
Thanks sir ❤😊
Sir how can I get all of your notes
Sir for CAT 2025 when will your enrollment begin
what would be the maximum no of cubes?
60
I did not get the concept of 40*20*30 cuboid.. Like when we cut it how we got 2 cube of 20*20*20?
The cuboid is 40*20*30
We should take the smallest number in 40*20*30 which is 20 and create a cube where all the sides are equal
That means we get 20*20*20, now we should check how many cubes we can take out from the cuboid, which is 2 cubes in total we can take out from the cuboid
Now there's still some volume left in the cuboid which is 40*20*10 which is another cuboid, therefore we should do the same process again until there's no volume left
Instead of taking 30*30*10, can we take 50*30*10? I did it but my answer is not matching.
I tried 50x30x10 instead of 30x30x10, and I got the answer of 19.
That what I got. So which answer is correct 19 Or 20 .
@@gyanbarik579 Even I did the same way, and I find it to be the easier way than what's shown in the video.
Add goggle pay number
Sir is this course still helpfull????
How to find the maximum number of cubes from the same size cuboid?
60..5*4*3of 10*10*10
Many thanks sir
Excellent 👍👌
Sir I customized this question and I made it 80×70×60 cm. What is the minimum number of cube that can I cut out from this?
My answer is 58. Is it correct?
Please help me 🙏🙂
My ans is 61
For your same ques
Mine is also 58
yes, i got 58 too
Sir any shortcut ?
There is no shortcut to success
@@Rodha are question ka shortcut pucha Raha hai wo sir 🤡🥲
@@Hehehe-ni8gb🤣🤣🤣🤣
Great sir🙏