Question

TYPE 35

7 years ago, the average age of a family of four persons was 30 years. In between these 7 years the family adopted a girl. Now at present the average age of the family is same as it was 7 years ago. Find the present age of the girl.

A 5 years Correct Answer Incorrect Answer
B 6 years Correct Answer Incorrect Answer
C 2 years Correct Answer Incorrect Answer
D 8 years Correct Answer Incorrect Answer
E None of these Correct Answer Incorrect Answer

Solution

Sum of the present age of the family excluding girl = 4 x (30 + 7) = 148 years Sum of the present age of the family including girl = 5 x 30 = 150 years Present age of the girl = 150 – 148 = 2 years

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