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 form the pair of the oldest and the youngest?
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Look for the relationship between the ages to deduce the oldest and youngest based on the clues provided in the question.
From the given information: - B is twice the age of A, so B>A. - F is twice as old as B, and thus F>B>A. - C is half the age of A and twice the age of D, so D<C<A. - The oldest is F, and the youngest is D. Therefore, the pair of the oldest and the youngest is F and D.