Question
6 years ago, the average age of a family of five persons
was 38 years. In between these 6 years the family adopted a girl. Now at present the average age of the family is same as it was 6 years ago. Find the present age of the girl.Solution
Sum of the present age of the family excluding girl = 5 x (38 + 6) = 220 years Sum of the present age of the family including girl = 6 x 38 = 228 years Present age of the girl = 228 – 220 = 8 years
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