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23 January, 13:25

Ali must choose a number between 61 and 107 that is a multiple of, 2, 4 and 5. Write all the numbers that he could choose.

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  1. 23 January, 13:31
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    They must all be divisible by the LCM of 2,4 and 5 which is 20

    So the required numbers are 80 and 100.
  2. 23 January, 13:35
    0
    80 is a multiple of all three of those numbers

    (2x40) (4x20) (5x16)

    100 is also a multiple of all three

    (2x50) (4x25) (5x20)
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