In a quiz competition, Tom ranks 12th from the top and 9th from the bottom. How many contestants participated?

B. 21

In the sequence 1, 3, 5, 7, 9, 11, how many times does the number 10 occur?

A. 0

B is ranked 5th from the bottom in a group of 25 people. What is B's rank from the top?

C. 19TH

In a race of 15 participants, C finishes 7th. If D finishes just before C, what is D's rank from the bottom?

B. 9TH

E is ranked 12th from the top and 9th from the bottom in a competition. How many participants are there in total?

B. 21