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If two boys and a girl can beat their father in a tug-of-war, but their mother can win against a boy and two girls, who should win a contest between the father and a girl against the other and a boy?
Ответ: The mother and boy. Pitting the 2 winning teams against the 2 losing teams (boy + boy + girl + mother versus father + boy + girl + girl) will obviously result in a win for boy + boy + girl + Mother over father + boy + girl + girl. Take a girl and boy away from each side, and boy + mother must still beat father + girl.
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