B is twice as old as A but twice younger than F.

C is half the age of A but twice the age of D.**Which two persons from the pair of oldest and youngest ?**

** Option:**

**A.**F and A

**B.**F and D

**C.**B and F

**D.**F and C

**E.**None of these

**Answer: B . F and D**

** Justification:**

Let A's age be x.

Then, B's age is 2x.

B is twice younger than F i.e. F is twice older than B. So, F's age is 4x.

C is half the age of A i.e. C's age is x/2. C is twice the age of D i.e D is half the age of C i.e. D's age is x/4.

So, the descending order of ages is F, B, A, C, D/

Clearly, **F is the oldest and D is the youngest.**