B is twice as old as A but half as old as F. C is half as old as A but twice as old as 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
Correct Option:
B
Explanation
Let A's age be x. Then B = 2x and, because B is half as old as F, F = 4x. Also, C = x/2 and D = x/4. Thus, F is the oldest and D is the youngest.
