Re: math teaser, kinda tough
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How did you get to Tom is the fireman without knowing John is older than Art? I got to conductor John is the nephew of the engineer (Pete) and the son of the fireman.
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If Person A is Person B's brother, and Person C is Person B's nephew, that does NOT imply that Person C is Person A's child. A brother of a father must be an uncle, but a brother of an uncle might be a father, another uncle, or someone unrelated by blood at all.
And it is, of course, possible for nephews to be older than uncles.
Not saying your solution is wrong - it may still be the only one logically consistent - just that it's not obvious to me how/why you leap to the conclusion that there's a father and son in the mix.
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