william was taking a math test he spent 3/4 of the class time on the test. when he turned it in he noticed there was 13 minutes of class left. how much time did he spend taking the test.

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Answer:

47 minutes

Step-by-step explanation:

3/4 of an hour is 45 minutes which makes 15 minutes remain and if it is 13 minutes left the 45 + 2 is 47