Question

Mr Li is four times as old as his son. In five years time, the sum of their ages will be 60 years. How old are they now?

Answer 1

Mr Li is now 40 years old

his son is now 10 years old

Explanation:

x = age Li

y = age son

x = 4y

x+5 + y+5 = 60

x + y + 10 = 60

x + y = 50

4y + y = 50

5y = 50

y = 10

x = 4y = 4×10 = 40