Question

john who is 42 years old has a nephew age 9. In how many years will the age of his nephew be one-fourth age?

Answer 1

let the time be x years

9+x = (1/4)(42+x)
times 4
36 + 4x = 42 + x
3x = 6
x=2

in 2 years

check:

John will be 44 , nephew will be 11
and 11 is 1/4 of 44