A man is six time as old as his son. Twenty years later, the man will be twice old as his son. Find the age of man when his son was born.

Question

Use the algebic method to solve the question you may draw models to help you formulate the question

Answer 1

Y is man, x is the son

Y = 6x

y+20 = 2(x+20)

6x + 20 = 2(x+20)

6x+20 = 2x + 40

6x + 20 -2x = 40

4x + 20 = 40

4x = 20

x = 5

Man is 30, son is 5

20 years later, man is 50 and son is 25 which is twice as old.