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16 September, 13:23

Stephen has art lesson every 6 days. And a swim lesson every 9 days. He has both art and swim lesson on Tuesday. On which day of the week will he have both lessons again?

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  1. 16 September, 13:51
    0
    6 and 9 go into 18

    tue - tue = 21 days

    - 3 days = sat
  2. 16 September, 13:52
    0
    The least common multiple would give you the answer you are looking for.

    Multiples of

    6: 6, 12, 18, 24, 30, ...

    9: 9, 18, 27, 36, ...

    He will have a lesson on the same day in 18 days.

    Starting on Tuesday we need to go 18 days. 14 days would be another Tuesday, Wednesday = 15, Thursday = 16, Friday = 17, Saturday = 18
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