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IQ Quiz
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Joe is three times as old as Bob, and Den is four times as old as Joe. Together their age is 192 years. How old is Joe?

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If Bob is x y.o., then Joe is 3x and Den is 4*3x = 12 x. x + 3x + 12 x = 192. x = 12. And Joe is 3x, so Joe is 36.

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