Ages 2

A man's age is four times his son's age. After five years, he will be just twice his son's age. Find their ages.

Correct answer:

f =  10
s =  2.5

Step-by-step explanation:


f = 4s
f+5 = 2(s+5)

f = 4·s
f+5 = 2·(s+5)

f-4s = 0
f-2s = 5

Row 2 - Row 1 → Row 2
f-4s = 0
2s = 5


s = 5/2 = 2.5
f = 0+4s = 0+4 · 2.5 = 10

f = 10
s = 5/2 = 2.5

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