Question

Three years ago, the average age of A, B and C was 27 years and that of B and C 5 years ago
was 20 years. A's present age is :
​

Answer 1

Step-by-step explanation:

A-3 + B-3 + C-3 /3 = 27

and

b-5 + c-5 /2 =20

b+c=50 and a+b+c=90

so a=40