37. The average age of a family of 6 members is 22 years. If the age of the youngest member be 7 years,
the average age of the family at the birth of the youngest member, was:
(c) 17.5 years
(d) 18 years
(a) 15 years
(b) 17 years
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Answer:
d
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Total age of 6 members = 22*6 = 132 years.
Total age of 5 members excluding youngest member = 132–7 = 125 years.
At the birth of youngest member, everyone's of the families age will be reduced by 7 years. So total age reduced = 5*7 = 35 years. Therefore theirs total age = 125–35 = 90 years.
Hence average of theirs age = 90 ÷ 5 = 18 years
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