In the sequence 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, how many numbers are less than or equal to 5?

A. 5

In the sequence 2, 4, 6, 8, 10, 12, how many times does the number 8 occur?

A. 1

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

A. 1

In the sequence 4, 8, 12, 16, 20, 24, how many times does the number 10 occur?

A. 0

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

A. 1