Question 974617
x = son's age now
4x = man's age now


x + 5 = son's age in 5 years
4x + 5 = man's age in 5 years


4x + 5 = 3(x + 5) {in 5 years, the man will be 3 times the son}
4x + 5 = 3x + 15 {used distributive property}
x + 5 = 15 {subtracted 3x from each side}
x = 10 {subtracted 5 from each side}
4x = 40 {substituted 5, in for x, into 4x}


son is 10
man is 40
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