WBCS Mains 2018 Official Paper-VI

A is $3$ years younger than C but one year older than D. D is one year older than B but $4$ years younger than C. C is $15$ years old. What is the age of B in years?

A girl counted in the following way on the fingers of her left hand: She started by calling the thumb $1$, the index finger $2$, middle finger $3$, ring finger $4$, little finger $5$ and then reversed direction calling the ring finger $6$, middle finger $7$ and so on. She counted up to $1994$. She ended counting on which finger?

By logic, which of the actions follows from the statement?
Statement: Youngsters are often found staring at obscene posters.
Courses of Action:
(i) Youngsters should be punished and penalized if they are found doing so.
(ii) Any display of such material should be banned.

It is observed that children of successful and well-to-do parents sometimes do not perform well in studies. Which one of the following alternatives offers a logical underlying reason behind it?

Choose the odd one out: