Question

A man is 41 years old and in seven years he will be four times as old as his son is at that time. How old is his son?

Answer 1

son is 5 years old

Explanation:

let the son's age be n when father is 41 years old

in 7 years

son will be n + 7 and father will be 41 + 7 = 48

at this time the father is 4 times as old as his son, that is

4(n + 7) = 48 ( divide both sides by 4 )

n + 7 = 12 ( subtract 7 from both sides )

n = 5

that is the son is 5 years old