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28 August, 18:35

Fred has 30 minutes to do a three-problem quiz. He spent 10 7/10 minutes on question a and 5 2/5 minutes on question b. How much time did he have left for question c?

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  1. 28 August, 20:46
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    Answer:Fred has 13 9/10 minutes left for question C

    Step-by-step explanation:

    The total time that Fred has to do the three-problem quiz is 30 minutes.

    He spent 10 7/10 minutes on question A. Converting 10 7/10 minutes to improper fraction, it becomes 107/10 minutes.

    He spent 5 2/5 minutes on question B. Converting 5 2/5 minutes to improper fraction, it becomes 27/5 minutes.

    Total time that Fred spent on question A and question B is

    107/10 + 27/5 = (107 + 54) / 10

    = 161/10 minutes.

    The amount of time that he has left for question C would be

    30 - 161/10 = (300 - 161) / 10 = 139/10

    = 13 9/10 minutes
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