Question

Roger had 30 minutes to do a three-problem quiz. He spent 11

3
4
minutes on question A and 6
1
2
minutes on question B. How much time did he have left for question C?

Answer 1

11 3/4 minutes

=============

First add up the time Roger spent on questions A and B.

He spent 11 3/4 minutes on question A and 6 1/2 minutes on question B.

These two times together add up to:

• 11 3/4 + 6 1/2 =
• 11 + 6 + 3/4 + 1/2 =
• 17 + 3/4 + 2/4 =
• 17 + 5/4 =
• 17 + 1 1/4 =
• 18 1/4 minutes

Roger had a total of 30 minutes to complete the quiz.

To find out how much time Roger had left for question C, we subtract the time he spent on question A and B from the total time:

• 30 - 18 1/4 =
• 30 - 18 - 1/4 =
• 12 - 1/4 =
• 11 3/4 minutes

So, Roger had 11 3/4 minutes left to complete question C on the quiz.