The average age of a husband and wife was 23 years when they were married 5 years ago. The average age of the husband, the wife and a child who was born during the interval, is 20 years now. How old is the child now?
OPtion
1) 9 month
2) 1 year
3) 3 years
4) 4 years
5) 1.5 years
6) 2 years
7) 3.5 years
8) 6 years
9) 5 years
10)None of these
Solution
Present total age of husband & wife = (2*23 + 2*5) = 56 years
Present total age of husband, wife & child = (3*20) = 60 years
Present age of the child = (60 - 56) years = 4 years