If F, another friend, is taller than C, how many of them will be between F and E according to their height ?
Answer: E
In terms of age, we have :
E < B, C < A, A < E, A < D
So, we have : C < A < E < B < A < D.
In terms of height, we have :
B < C, D < C, E < C, D < A
Since no definite order of height can be obtained, so it cannot be determined for sure how many persons lie between F and E.