Question
5 years ago, the average age of a family of five persons
was 30 years. In between these 5 years the family adopted a girl. Now at present the average age of the family is same as it was 5 years ago. Find the present age of the girl.Solution
Sum of the present age of the family excluding girl = 5 x (30 + 5) = 175 years Sum of the present age of the family including girl = 6 x 30 = 180 years Present age of the girl = 180 – 175 = 5 years
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