The average age of family of five members is 24 years. If the present age of youngest member is 8 years. What was the average age of the family at the time of birth of youngest member? |
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a) |
16 years |
b) |
18 years |
c) |
20 years |
d) |
21 years |
The average age of family of five members is 24 years. If the present age of youngest member is 8 years. What was the average age of the family at the time of birth of youngest member? |
|||||||
a) |
16 years |
b) |
18 years |
c) |
20 years |
d) |
21 years |
Total age of all members of family = 5×24=120 years.
∴ Sum of the remaining 4 members at the time of youngest member’s birthday=120-(8×5)=80 years
∴ Average of the remaining 4 members=years.