SOLUTION: Josh is 3 years olden than Jim. Jim is 4 years less than twice David's age. How old are the three boys if their ages add up to 35?

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Question 1165653: Josh is 3 years olden than Jim. Jim is 4 years less than twice David's age. How old are the three boys if their ages add up to 35?
Answer by josgarithmetic(39617) About Me  (Show Source):
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Josh             2d-1           15
Jim              2d-4           12
David            d               8
SUM             35

%282d-1%29%2B%282d-4%29%2Bd=35
-
5d-5=35
5d=40
d=8