Time is constant. There might be questions about how long a working week is, but? Cells can change and such at different rates depending on certain factors in a biological sense, but time itself can't because it is constant. Logically it can't be changed, unless you make something like a 555 timing chip speed-up by a physical input as an example. But won't change anything about the constant.
I done it mentally right now in 20 sec. ! Now Bob is 8 years old and Adam 36, in 6 years they will have respective 14 & 42..... because 14●3=42 ;) ~> with a equation will be so: *A+28+B=3B+6+A+6* ~> -2B=A-A+12-28 ~> -2B=-16 ~> B=16/2 ; today *B=8* ; *A=8+28=36*
Here's an alternative way, using the fact that "three times as old as" is the same as "two times older than": The age difference (28 years) doesn't change, so in 6 years Bob has to add twice his age to his own to reach Adams age. Or he could still add 28 years, so: 2*(Bob+6)=28 --> Bob+6=14 --> Bob=8. Since Adam=Bob+28, then Adam=36.
My weak spot was always word problems, a few years ago I watched this channel, this was the first video of it I watched. Thanks so much, I have been able to pass down this knowledge to my friends who don't understand. Great video, dropped a sub.
By reading the question...we should let Bob' s age as x and Adam's age as x + 28 Then, (x+28) +6 = 3( x +6) x + 34 = 3x +18 3x-x = 34-18 2x = 16 x = 8 Adam's age now = 28 + 8= 36 Only my suggestion. Tq
hey going to try to join the plumbers union and i have to take a math test to get in. o boy this kicked me in the teeth. just so darn hard to decipher whats being asked and how to solve. but thank you im trying. watched this vid 3 times. your content on this topic is probably explained the best out of the 10 other vids i watch so thank you.
This reminds me of that old Abbott and Costello routine: - You’re 40 years old and theres a girl that’s 10 years old. You’re four times as old as that girl - you wait five years. By that time the girl’s 15 and you’re 45. You’re only three times as old as that girl. - you wait 15 years and the girl is 30, you’re at 60. You’re twice as old as the girl. - How long do you have to wait until you and that girl are the same age? 😂😂😂👍
Abott can't be 100% same age of the girl ( There will be always age gap of 30 years) For 99% same age , His age would be 3000 years and the girl's age would be 2970 years For 99.99% , His age would be 300000 years and her's would be 299970 years🤩
A = B + 28 A + 6 = 3 ( B + 6 ) ( B + 28 ) + 6 = 3 ( B + 6 ) B + 34 = 3B + 18 2B = 16 B = 8 Adam is 36, and Bob is 8. In 6 years, Adam is 42, and Bob is 14.
In Adams Equation you deducted 28 from Bob but in Carls Equation you added 12 to Carls age , both equation mention of being them old then why the difference in building that equation ?
It's negative on the right side and you want to make it neutral (0) so you don't have to think about it in the equation. That's why you add the opposite, a positive, to make it 0. Basically -66+66=0. Because you did something on one side of the equation, you also have to do it on the other side. So 6+66=72. If you're asking why we're not subtracting the 6 and adding it on the other side, it's because we want to have a number on one side and the x on the other side of the equation. Definitely butchered math here, but it's the way I understand it. Hope it helps you.
@tecmath actually, I still, don't get it. It's (x+6) -28. No matter how you look at the logic, you can't just trim six years from the age gap, unless you are saying "In 6 years time, Adams age will be 3 times the age he is now" which you haven't. No matter how old I am, I'm still 2 years younger than my sister. I can't just get closer in a maths puzzle because each year my sister gets older, and so do I.
About the Problem of Erin and Faye, I think the age of Eric is 14 not 6. THE PROBLEM : Erin is 13 years younger than Faye. In eight years the sum of their ages will be 41. How old is Erin? SO; Erin | Faye x x + 13 +8 +8 x+8 x+21 x+ 8 + x + 21 = 41 2x + 29 = 41 2x = 41-29 2x = 12 x = 6 So, since the problems seeks to find the age of Erin then let us back to the given expression which is x+8. then we have now the value of x which is 6, then evaluate. x + 8 6 + 8 = 14 therefore the age of Erin is 14. If we will going to check also the age of Faye that goes; x + 21 = 0 6 + 21 = 27 therefore on the other hand FAYE is 27 year old. ERIN = 14 FAYE = 27 ----------- 41 is the sum of their age.
Adam = Bob + 28 (1) Adam + 6 = 3(Bob + 6) (2) Subtract (1) - (2) -6 = -2Bob + 10 Bob = 8 so Adam = 8 + 28 = 36 6 year from now Bob = 14 and Adam = 42 42 = 3(14)
You forgot to add plus 6 to Bob in the second equation like I did. When Adam is 6 years older, Bob will also be 6 years older, so "A = B + 28" and "A + 6 = 3 (B + 6)".
Adam is currently 36. I just did a number chart starting with 28 and 0 then continued onward until I got the exact match. Then went backwards 6 years to find the current ages.
I could never do these questions growing up, it wasn't really an issue about the maths, it was the badly worded written questions. In the last question, Dave is half the age of Carl, but we multiple Dave by 2, doesn't that make Dave twice as old as Carl instead?
If you always let “x” represent the younger person, you can do these without the negative signs. Bob is “x” now and Adam is “x + 28”. Much easier for most students to learn.
![Lp. Сердце Вселенной #60 РОЖДЕНИЕ ЛОЛОЛОШКИ [Финал] • Майнкрафт](http://i.ytimg.com/vi/YoR0pAV9FVQ/mqdefault.jpg)
Time and work problems here ua-cam.com/video/8U6nA_eOzCE/v-deo.htmlsi=XxCcDItJqesgkBzJ
Time is constant. There might be questions about how long a working week is, but?
Cells can change and such at different rates depending on certain factors in a biological sense, but time itself can't because it is constant.
Logically it can't be changed, unless you make something like a 555 timing chip speed-up by a physical input as an example. But won't change anything about the constant.
@@gavingiant6900😊😊
I done it mentally right now in 20 sec. ! Now Bob is 8 years old and Adam 36, in 6 years they will have respective 14 & 42..... because 14●3=42 ;) ~> with a equation will be so:
*A+28+B=3B+6+A+6* ~>
-2B=A-A+12-28 ~>
-2B=-16 ~> B=16/2 ; today
*B=8* ; *A=8+28=36*
Here's an alternative way, using the fact that "three times as old as" is the same as "two times older than":
The age difference (28 years) doesn't change, so in 6 years Bob has to add twice his age to his own to reach Adams age.
Or he could still add 28 years, so:
2*(Bob+6)=28 --> Bob+6=14 --> Bob=8.
Since Adam=Bob+28, then Adam=36.
My weak spot was always word problems, a few years ago I watched this channel, this was the first video of it I watched. Thanks so much, I have been able to pass down this knowledge to my friends who don't understand. Great video, dropped a sub.
"Sorry about the kookaburra in the background" - now there's something I didn't expect to hear in a maths video. Great explanation by the way!
Bob passed away, and Adam went onto a longer life. Common sense.
😂😂😂😂
😆😆😆😆
lol HAHAHHAHQQ
😂
Hahaha
By reading the question...we should let Bob' s age as x and Adam's age as x + 28
Then, (x+28) +6 = 3( x +6)
x + 34 = 3x +18
3x-x = 34-18
2x = 16
x = 8
Adam's age now = 28 + 8= 36
Only my suggestion. Tq
🙌
❤
What a great video! Thank you so much!
8:50 "Let's group all our exes together" well it's going to get crowded I'm afraid.
you do not have play like that.
@@noor-qq4zc just learn your math🥱
Lolol
Hiiiii! Love your videos! BIG fan!
Thanks a bunch Josh, I used to find it difficult to solve these kinda questions, but now I can do just fine!
Thank you for the concise and effective lesson. I always had difficult times with solving this kind of questions in GRE / GMAT.
yeah same
Thanks this helped me a lot
I prefer to do these as two different equations with x and y and then use substitution.
TYYYY bro I was struggling so much but now I can understand thanks Josh
Thanks Sir!!! it did help a lot
hey going to try to join the plumbers union and i have to take a math test to get in. o boy this kicked me in the teeth. just so darn hard to decipher whats being asked and how to solve. but thank you im trying. watched this vid 3 times. your content on this topic is probably explained the best out of the 10 other vids i watch so thank you.
great video😃
6:13 can you change the sentence to understandable❤
The doctor couldn’t perform surgery on him because she was his mother.
Hey isn’t Adam’s age now meaning (x + 6) which is 36 + 6 = 42
I think I'll stick to the method where I plug in random ages till I get the correct answer
Thank you very much sir
This reminds me of that old Abbott and Costello routine:
- You’re 40 years old and theres a girl that’s 10 years old. You’re four times as old as that girl
- you wait five years. By that time the girl’s 15 and you’re 45. You’re only three times as old as that girl.
- you wait 15 years and the girl is 30, you’re at 60. You’re twice as old as the girl.
- How long do you have to wait until you and that girl are the same age?
😂😂😂👍
Abott can't be 100% same age of the girl ( There will be always age gap of 30 years)
For 99% same age , His age would be 3000 years and the girl's age would be 2970 years
For 99.99% , His age would be 300000 years and her's would be 299970 years🤩
i didn't get 2:50 how do you minus x from x and know how much to minus so that 3x - x is 2x
See it like this 3x-1x= 2x
A = B + 28
A + 6 = 3 ( B + 6 )
( B + 28 ) + 6 = 3 ( B + 6 )
B + 34 = 3B + 18
2B = 16
B = 8
Adam is 36, and Bob is 8.
In 6 years, Adam is 42, and Bob is 14.
In Adams Equation you deducted 28 from Bob but in Carls Equation you added 12 to Carls age , both equation mention of being them old then why the difference in building that equation ?
where did 29 came from? 5:36
you add like terms so 8 + 21
3:09 "so we're gonna add 66..."
Why?? Why are we doing this???
It's negative on the right side and you want to make it neutral (0) so you don't have to think about it in the equation. That's why you add the opposite, a positive, to make it 0. Basically -66+66=0.
Because you did something on one side of the equation, you also have to do it on the other side. So 6+66=72.
If you're asking why we're not subtracting the 6 and adding it on the other side, it's because we want to have a number on one side and the x on the other side of the equation.
Definitely butchered math here, but it's the way I understand it. Hope it helps you.
Is there any blood relation problems tricks
Isn’t Adam gonna get older as well as bob?
Yes, I think adding 6 to the negative difference is warping the maths. The gap should always be 28, not become 22.
=
@@petermiddo exactly
@@petermiddo the difference after 6 years is added is still 28 years.
Compare x +6 to x - 22.
There is a +28 difference.
@tecmath actually, I still, don't get it. It's (x+6) -28. No matter how you look at the logic, you can't just trim six years from the age gap, unless you are saying "In 6 years time, Adams age will be 3 times the age he is now" which you haven't.
No matter how old I am, I'm still 2 years younger than my sister. I can't just get closer in a maths puzzle because each year my sister gets older, and so do I.
@@petermiddohe didn't trim 6 years from the gap, he added six to both sides, with the gap remaining the same. 6-(-22)=28.
About the Problem of Erin and Faye, I think the age of Eric is 14 not 6.
THE PROBLEM : Erin is 13 years younger than Faye. In eight years the sum of their ages will be 41.
How old is Erin?
SO;
Erin | Faye
x x + 13
+8 +8
x+8 x+21
x+ 8 + x + 21 = 41
2x + 29 = 41
2x = 41-29
2x = 12
x = 6
So, since the problems seeks to find the age of Erin then let us back to the given expression which is x+8.
then we have now the value of x which is 6, then evaluate.
x + 8
6 + 8 = 14
therefore the age of Erin is 14.
If we will going to check also the age of Faye that goes;
x + 21 = 0
6 + 21 = 27
therefore on the other hand FAYE is 27 year old.
ERIN = 14
FAYE = 27
-----------
41 is the sum of their age.
Second example: If in 8 years the sum is 41, that means the sum now is 25. So 2x + 13 = 25.
Mentally Erin is 6 years old and Faye 19, now the sum of their age is 25 years, in 8 years their age will be 25+2●8=25+16= *41* ;)
Mentally *Dave* age is now 14. Two years ago was 12 and Carl 24. ;)
Adam now identifies as 16 year old Eve 😅
god i hate arithmetic reasoning 😩 god bless
Adam = Bob + 28 (1)
Adam + 6 = 3(Bob + 6) (2)
Subtract (1) - (2)
-6 = -2Bob + 10
Bob = 8 so Adam = 8 + 28 = 36
6 year from now
Bob = 14 and Adam = 42
42 = 3(14)
I got adam is 45😭
You forgot to add plus 6 to Bob in the second equation like I did. When Adam is 6 years older, Bob will also be 6 years older, so "A = B + 28" and "A + 6 = 3 (B + 6)".
Adam is currently 36. I just did a number chart starting with 28 and 0 then continued onward until I got the exact match. Then went backwards 6 years to find the current ages.
I could never do these questions growing up, it wasn't really an issue about the maths, it was the badly worded written questions. In the last question, Dave is half the age of Carl, but we multiple Dave by 2, doesn't that make Dave twice as old as Carl instead?
No, try it with numbers.
Carl is 10 and Dave is 5. Half the age of Carl.
If we multiply 5 by 2 it equates to 10.
What should I do if Bob is -4 years old
He is a sperm in my nuts
Give birth to him
blow up the maths, crazy
Erin 6
Not easy . Very harder to to way this solve
I don't understand x
D is 12
Anyon can guess my age? Twelve years ago my eldest brother is twice my age..And now he is 3 years older than me.
15
I wrote it the other way
70
36
Wow🎉
If you always let “x” represent the younger person, you can do these without the negative signs.
Bob is “x” now and Adam is “x + 28”. Much easier for most students to learn.
YOUR METHOD IS CON😅😅😅