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?
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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
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