Question 1159704
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Bob + Tom   + Phil    = 55


B   + (B-4) + (B + 8) = 55


3B + 4 = 55


3B     = 55 - 4


3B     = 51


 B     = 51/3 = 17.


<U>ANSWER</U>.  Bob is 17;  Tom is 17-4 = 13;  Phil is 17+8 = 25.


<U>CHECK</U>.   17 + 13 + 25 = 55.    ! Correct !
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Solved.