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28 January, 17:33

On monday eliza read her book. on tuesday she read three times as long as she read on monday. on wednesday she read 20 minutes less than tuesday. on thursday she read for 20 minutes which was half as long as she read on wednesday. how many minutes did eliza read over the 4-day period

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  1. 28 January, 18:27
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    Monday : x

    tuesday : 3x

    wednesday : 3x - 20 = 40

    thursday: 20

    3x - 20 = 40

    3x = 40 + 20

    3x = 60

    x = 60/3

    x = 20

    monday : 20 minutes

    tuesday : 3x ... 3 (20) = 60 minutes

    wednesday : 40 minutes

    thursday: 20

    for a total of : 140 minutes <===
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