Five friends A, B, C, D, and E are sitting in a row facing North. A is to the immediate right of B. C is to the immediate left of D. E is to the immediate left of B. Who is sitting exactly in the middle?

Seven people, P, Q, R, S, T, U and V, are sitting in a straight line, facing north. T is sitting third to the right of V. Only three people are sitting between S and R. R is sitting to the immediate left of T. S is sitting at the extreme left corner. P is sitting second to the left of U. Who is sitting at the extreme right corner?

Seven people, A, B, C, D, E, F and G, are sitting in a row, facing north. No one sits to the left of C. Only four people sit between C and A. Only three people sit to the right of G. E sits to the immediate left of B. F is not an immediate neighbour of G. How many people sit to the right of D?