Question 1135247
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Sister + Son      + Man          = 77


Sister + 2*Sister + 2*(2*Sister) = 77


Sister + 2Sister  + 4*Sister     = 77


7*Sister = 77   =================>  Sister = 77/7 = 11.


<U>Answer</U>.  Sister = 11;  Son = 2*11 = 22;  Man = 4*11 = 44.
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Solved.