Question
9 years ago, the average age of a family of six persons
was 60 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. TYPE 35Solution
Sum of the present age of the family excluding girl = 6 x (60 + 9) = 414 years Sum of the present age of the family including girl = 7 x 60 = 420 years Present age of the girl = 420 – 414 = 6 years
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