A) 1 yr
B) $ 1\frac{1}{2},yr $
C) 2 yr
D) 3 yr
Correct Answer: C
$ \therefore $ Total present age of a family of 5 members $ =85+5\times 3 $ $ =85+15=100,yr $ and total present age of a family of 6 members $ =6\times 17=102,yr $
$ \therefore $ Present age of the baby $ =(102-100)=2,yr $