Question

B is twice as old as A but twice as young as F.
C is half the age of A but twice the age of D.
Which two persons form the pair of the oldest and the youngest ?

• A. F and A
• B. F and D
• C. B and F
• D. F and C
• E. None of these

Answer 1

The correct option is B F and D

Let A's age be x.

Since B is twice as old as A 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 will be F, B, A, C, D.
Clearly, F is the oldest and D is the youngest.

Hence, F and D is the answer.