3 years ago

A father is 60 years old and his son is half his age how old was the boy when his father was four times his age

1 answer:

5 0

F=60, s=60/2=30

(60-x)/(30-x)=4

60-x=120-4x

60+3x=120

3x=60

x=20

s=30-x

s=30-20

s=10

So the boy was 10 years old when his father was four times his age.

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