Math

For the integers from 1 to 1000, how many multiples of 9 are also multiples of 6?

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asked by Andrew

  1. multiples of 9:
    9 18 27 36 45 54 63 72 81 90 ..
    multiples of 6
    6 12 18 24 30 36 42 48 54 60 66 72 ..

    the ones found in each are:
    18 36 54 72 ..
    that is multiples of 3*3*2 or 18

    number of multiples of 18 in 1000:
    1000/8 = 55.55..

    There 55 of them

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    posted by Reiny

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