Ages 2

A man's age is 4 times his son's age. After 5 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

f = 10
s = 5/2 = 2.5

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