4 years ago, the average age of a family of six persons was 30 years. In between these 4 years the family adopted a girl. Now at present the average age of the family is same as it was 4 years ago. Find the present age of the girl.
Sum of the present age of the family excluding girl = 6 x (30 + 4) = 204 years Sum of the present age of the family including girl = 7 x 30 = 210 years Present age of the girl = 210 – 204 = 6 years
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