Question
7 years ago, the average age of a family of four persons
was 36 years. In between these 7 years the family adopted a girl. Now at present the average age of the family is same as it was 7 years ago. Find the present age of the girl. TYPE 35Solution
Sum of the present age of the family excluding girl = 4 x (36 + 7) = 172 years Sum of the present age of the family including girl = 5 x 36 = 180 years Present age of the girl = 180 – 172 = 8 years
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