In a class of 30 students, A is ranked 10th from the top. What is A's rank from the bottom?

B. 21ST

In a race of 40 participants, D finishes 15th. If E finishes 5 places behind D, what is E's rank from the bottom?

B. 22ND

In a race of 15 runners, if Mark is ranked 8th from the top and then swaps positions with the runner ranked 10th, what will be Mark's new rank from the top?

C. 9TH

Alice is ranked 15th from the bottom in a group of 40 people. If she swaps ranks with Bob, who is ranked 10th from the top, what will be Alice's new rank from the top?

C. 25TH

E is ranked 3rd from the top and 7th from the bottom in a group. How many people are in the group?

B. 10