Question
8 years ago, the average age of a family of six persons
was 50 years. In between these 8 years the family adopted a girl. Now at present the average age of the family is same as it was 8 years ago. Find the present age of the girl.Solution
Sum of the present age of the family excluding girl = 6 x (50 + 8) = 348 years Sum of the present age of the family including girl = 7 x 50 = 350 years Present age of the girl = 350 – 348 = 2 years
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