Question
7 years ago, the average age of a family of four persons
was 30 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.Solution
Sum of the present age of the family excluding girl = 4 × (30 + 7) = 148 years Sum of the present age of the family including girl = 5 × 30 = 150 years Present age of the girl = 150 – 148 = 2 years
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