Freshman maths problems: Formal proof of validity of Argument using Rules of Inferences (questions)

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A survey of 240 families showed that 91 had a cow; 70 had an ox; 31 had a cow and an ox; 91 had neither an ox nor cow,and in addition did not have a goat; 7 had an ox, a cow, and a goat how many had a goat only?

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