The sum of the ages of father and son is 66 years old, and the age of father is three times younger than that of son, 10 years old.

Q: 1. How old are father and son this year?

How many years ago, my father was five times as old as my son?

Solution:

1、

(66+ 10)÷(3+ 1)

=76÷4

= 19 year old son

19×3- 10

=57- 10

=47 years old father

Or: 66- 19=47 years old.

A: My father is 47 years old and my son 19 years old.

2、

(47- 19)÷(5- 1)

=28÷4

=7-year-old son

19-7= 12 years

A: Before 12, the father was five times older than his son.