Seven people, L, M, N, O, W, X and Y, are sitting in a row, facing north (but not necessarily in the same order). Only L sits to the left of X. Only four people sit between L and N. Only M sits between O and W, and O is not an immediate neighbour of N. Who sits at the extreme right of the line?

7 boys P, Q, R, S, T, U and W are sitting in a row facing north (not necessarily in the same order). No one is to the right of Q. R is fourth to the left of Q. W is second to the left of R. T is fourth to the right of U. P is not second to the right of U. Who is sitting to the immediate right of P?

5 boys R, M, N, B and C are sitting in a row facing north (not necessarily in the same order). Only B and R are to the left of M. N is to the immediate right of M. R is not at the ends of the row. Who is sitting to the right of N?

P, Q, R, S, T, U and V are sitting in a straight line, facing north. S is sitting second to the left of R. U is sitting fourth to the right of S. Only one person is sitting between P and V. Q is sitting second to the right of V. Only one person is sitting between Q and T. How many people are sitting between S and T?

Six people, A, B, C, D, E and F, are sitting in a row, facing north. F sits to the immediate left of A. C sits third to the left of D. C is an immediate neighbour of A. B sits to the immediate left of E. How many people sit between E and C?

Seven friends, D, E, F, U, V, W and X, are sitting in a straight line, facing north. No one sits to the right of D. Only three people sit between D and F. Only two people sit between F and E. X sits third to the left of V. W sits to the immediate right of V. How many people sit between U and E?

Seven people, L, M, N, O, P, Q and R, are sitting in a row, facing north. Only two people sit to the right of N. Only two people sit between N and R. Only two people sit between L and Q. Q sits to the immediate left of N. O sits to the immediate right of P. Who sits at the third position from the left end of the line?

Six people, E, F, G, H, I and P, are sitting in a row, facing north. Only two people sit to the left of P. Only two people sit between P and E. Only one person sits between E and H. Only I sits between P and G. How many people sit between F and I?