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21 April, 17:45

Between 20 and 28 students signed up for the chess club. The students could not be divided exactly into groups of 2, 3, 4, and 5. how many students signed up for the chess club?

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  1. 21 April, 18:07
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    Possibilities

    20,21,22,23,24,25,26,27,28

    2 remove all even

    21,23,25,27

    3 rules out 21 and 27

    23,25

    5 pulls out 25

    23 is the answer
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