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
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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.
