The average age of a family of five is 27 years. The current age of the youngest member of the family, Rita, is 10 years. What was the average age of the family just before Rita’s birth?
Explanation:
Total age of 5 members = 27 × 5 = 135
Total age of 4 members excluding Rita = 135 – 10 = 125
Present average age of 4 members excluding Rita = 125/4 = 31.25
∴ Average age of 4 members 10 years ago = 31.25 – 10 = 21.25
Hence, option (c).
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