| The average age of the family of five members is 24 yr. If the present age of youngest member is 8 yr, then what was the average age of the family at the time of the birth of the youngest member? |
A) 20 yr
B) 16 yr
C) 12 yr
D) 28 yr
E) 21 yr
Correct Answer: C
Solution :
| Total age of family members |
| \[=5\times 24=120\,yr\] |
| Age of youngest member = 8 yr |
| \[\therefore \] Average age of family at the time of birth of youngest member \[=\,\,\frac{120-8}{5-1}\,\,=\,\,\frac{112}{4}=28\,yr\] |
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