In the sequence 12, 15, 18, 21, 24, 27, how many times does the number 24 occur?

A. 1

In the sequence 0, 1, 1, 2, 3, 5, how many times does the number 1 occur?

B. 2

In the sequence 10, 20, 30, 40, 50, how many multiples of 15 are present?

A. 1

In a class of 30 students, John is ranked 12th from the top. What is his rank from the bottom?

B. 18TH

Alice is 5th from the top and 26th from the bottom in a competition. How many participants are there in total?

B. 31