Question

the average age of wife and husband who were married 10 years ago was 20 years then. including a child the present average age of the family is 23 years. What is the present age of the child?​

Answer 1

Wife and husband were married = 10 years ago (given)

Average age of family = 23 years

Thus, sum of age of husband and wife 5 years ago =23*2=46

The total present age of husband and wife is 46+10=56

Sum of the present ages of husband, wife and the child = 3 × 20 =60

Therefore the age of son will be =  60-56

                  Age                             =4 years