1. Five people A, B, C, D, and E are sitting in a row. B is to the right of A and left of C. D is to the left of A. E is to the right of C. Who is sitting in the middle?

2. In a row of 50 students, Ethan is 13th from the right end. What is his position from the left end if Sophia, who is 11th from the left end, is 8 places to the left of Ethan?

3. Six books A, B, C, D, E, and F are placed on a shelf. E is to the immediate right of D. C is between A and B. F is to the left of A. What is the position of B from the right end?

4. Six friends P, Q, R, S, T, and U are sitting in a row facing south. S is between U and R. P is second to the left of U. T is second to the right of Q. Who is sitting at the left end?

5. Six friends P, Q, R, S, T, and U are sitting in a row facing north. S is between U and R. P is second to the right of U. T is second to the left of Q. Who is sitting at the right end?

6. In a row of 40 children, R is 11th from the left end and T is 9th from the right end. How many children are there between R and T?

7. Six books A, B, C, D, E, and F are placed on a shelf. D is to the immediate left of C. B is between E and F. A is to the left of E. What is the position of F from the right end?

8. In a row of 40 students, Oliver is 12th from the right end. What is his position from the left end if Emma, who is 10th from the left end, is 6 places to the left of Oliver?

9. In a line of people, A is 10th from the front and B is 25th from the end. If there are 5 people between A and B, and B is behind A, how many people are there in the line?

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