Ben is 39 years old and Isaac is 3 years old how many years will it take until Ben is only four times as old as Isaac

Question

Ben is 39 years old and isac is 3 years old. How May years will it take until ben is only 4 times as old as isac

Answer 1

Let the number of years till this happens be x. At that time Bens age will be 39+x and Isaac will be 3+x

If Ben is 4 times as old then. 39+x = 4(3+x)

39+x = 12 +4x

3x=27

x=9 years