Michael P. answered • 02/17/18

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Let S = Steve's age now (yr) M = Marvin's age now (yr) M' = Marvin's age 5 years ago = M - 5 = ?

1) S = M + 2

2) (S - 5) + (M - 5) = S + 10

Substitute eqn 1) into eqn 2) and solve for M:

(M + 2 - 5) + (M - 5) = (M + 2) + 10 (combine like terms)

2*M - 8 = M + 12

M = 20

and

M' = M - 5 = 20 - 5 = 15 yrs old (Marvin's age 5 years ago)