The average age of a family of five member is 24. If the present age of the youngest member is 8 yr, what was the average age of the family at the time of the birth of the youngest member?

20 yr
16 yr
12 yr
18 yr

Correct Answer: 20 yr

Explanation:

∵ Total age of five members of a family = 24 x 5 = 120
∴ Total age of four members at the time of birth of youngest = 120 - 8 x 5
= 120 - 40 = 80 yr
Hence, required average age = 80/4 = 20 yr

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