Seven friends L, M, N, O, P, Q and R, each has a different height. R is taller than L. L is taller than M. N is the tallest among all. Only two people are taller than Q. O is not the shortest among all. Only one person is shorter than M. How many people are taller than R?

3

Seven friends: L, M, N, O, P, Q and R.

1. N is the tallest among all.

N > - > - > - > - > - > -

2. Only one person is shorter than M.

N > - > - > - > - > M > -

3. Only two people are taller than Q.

N > - > Q > - > - > M > -

4. L is taller than M.

N > - > Q > - > L > M > -

5. R is taller than L and shorter than Q.

N > - > Q > R > L > M > -

6. O is not the shortest among all.

N > O > Q > R > L > M > -

The remaining place is for P.

N > O > Q > R > L > M > P

So, 3 persons are taller than R.