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18 July, 01:22

Ahmed is regularly late to lessons. He has an average lateness of 7 minutes. There are 20 lessons a week and 38 weeks a year. Work out how many hours of learning he has missed over the course of a year.

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  1. 18 July, 04:11
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    Because he has 20 lessons a week, and is late 7 times a lesson, we know that he misses 20*7 minutes a week.

    Because there are 38 weeks a year, we multiply the unit rate by 38:

    38*140 = 5320

    Because we're looking for hours, not minutes, we divide by 60:

    5320/60

    532/6

    8 (4/6)

    8 2/3 hours
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