1. In a row of 25 students, when Amit was shifted by four places towards the right, he became 15th from the left end. What was his earlier position from the right end of the row?

2. Six friends P, Q, R, S, T, and U are sitting in two rows of three each facing each other. P is not at the end of any row. T is opposite to R. S is opposite to Q. U is at the end of a row. Who is opposite to P?

3. In a circular arrangement of six people A, B, C, D, E, and F, A is between F and C, E is between C and D, and B is between D and F. Who is sitting opposite to A?

4. Six people A, B, C, D, E, and F are sitting in a row. D is between B and F. A is to the immediate left of B. E is to the left of C. Who is sitting at the extreme left end?

5. Six friends P, Q, R, S, T, and U are sitting around a circular table facing the center. S is between U and P. R is to the immediate right of P and to the immediate left of Q. T is not between U and Q. Who is to the immediate left of S?

6. Five people P, Q, R, S, and T are sitting in a row. R is not at the end of the row. Q is to the right of S. P is to the left of S and right of T. Who is sitting in the middle?

7. Five books P, Q, R, S, and T are placed on a shelf. S is to the left of Q and to the right of T. P is to the left of T. R is to the right of Q. What is the position of Q from the right end?

8. In a line of people facing north, A is 10th from the left end and B is 9th from the right end. If A is 4 places to the right of B, how many people are there in the line?

9. In a class of 55 students, Ethan's rank is 13th from the top. Sophia is 8 ranks below Ethan. What is Sophia's rank from the bottom?

10. Five friends P, Q, R, S, and T are sitting in a circle facing the center. P is to the immediate right of Q. S is to the immediate right of R. T is to the immediate left of Q. Who is sitting between R and T?