Three 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
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.
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