The average age of a family of 6 member is 22 years . if the age of the youngest member be 7 years , what was the average age of the family at the birth of the youngest member was?

15 years
17 years
17.5 years
18 years

Correct Answer: 18 years

Explanation:

Total present age of the family = 6 x 22
= 132 years
Total age of the family 7 years ago = 132 - 7 x 6
= 90 years
At that time, the number of members was 5
∴ Average age at time = 90 / 5 years
= 18 years

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