9) The average age of a husband and his wife was 22
years, when they were married 7 years ago. The
average age of the husband, wife and a child at
present is 21 years. What is the age of the child?
b) 5 yrs
c) 3 yrs
d) 10 yrs
a) 4 yrs
Answers
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Answer:
Total age of husband and wife, 7 years ago = 22 × 2 = 44
Total age of husband and wife now = 44 + 2 × 7 = 58
Total age of husband, wife and child now = 3 × 21 = 63
Child's age = 63 - 58 = 5 years
Therefore, the age of the child is 5 years.
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