Seven friends A, B, C, D, E, F and G, each has a different height. C is taller than D. A is the shortest among all. Only four people are taller than C. E is taller than G but shorter than F. F is not the tallest. The height of how many people is between the heights of B and G ?

2

So;

Step 1: C is taller than D. Only four people are taller than C.

So, _> _> _> _> C> D

Step 2: A is the shortest among all.

So, _> _> _> _> C> D> A

Step 3: E is taller than G but shorter than F. F is not the tallest.

So, _ > F > E> G> C> D> A

If F is not the tallest only B is left to place therefore,

So, B> F> E> G> C> D> A

Therefore, there are 2 people between the heights of B and G.