Question

Three years ago the average age of a and b was 18 years. With c joining them, the average becomes 22 years. How old is c now ?


a. 24 years


b. 27 years


c. 28 years


d. 30 years


how to solve?

Answer 1

3years ago

A+B /2 =18

A+B = 36 (substitute in below)

A+B+C/3 = 22

36+C= 66

C=30 -3 years

C present age is 27