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Average - General Aptitude

Q1:

The average age of husband, wife and their child 3 years ago was 27 years and that of wife and the child 5 years ago was 20 years. The present age of the husband is:

A 35 years

B 40 years

C 50 years

D None of these

ANS:B - 40 years

Sum of the present ages of husband, wife and child = (27 x 3 + 3 x 3) years = 90 years. Sum of the present ages of wife and child = (20 x 2 + 5 x 2) years = 50 years.  Husband's present age = (90 - 50) years = 40 years.