| 3 yr ago, the average age of a family of 5 members was 17 yr. A baby having been born, the average age of the family is same today. The present age of the baby is [SSC (CGL) 2014] |
A) \[1\,\,yr\]
B) \[1\frac{1}{2}\,\,yr\]
C) \[2\,\,yr\]
D) \[3\,\,yr\]
Correct Answer: C
Solution :
| Present age of family of 5 member |
| \[=17\times 5+5\times 3=85+15=100yr\] |
| Total age of family of 6 members \[=6\times 17=102\,\,yr\] |
| \[\therefore \]Present age of baby \[=102-100=2yr\] |
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