Question
9 years ago, the average age of a family of five persons
was 50 years. In between these 9 years the family adopted a girl. Now at present the average age of the family is same as it was 9 years ago. Find the present age of the girl.Solution
Sum of the present age of the family excluding girl = 5 x (50 + 9) = 295 years Sum of the present age of the family including girl = 6 x 50 = 300 years Present age of the girl = 300 – 295 = 5 years
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