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The least number of pens required to make complete sets of 20, 24, 30, are?

  • math -

    This is the same as finding a Lowest Common Denominator

    20 = 2*2*5
    24 = 2*2*2*3
    30 = 2*3*5

    so we need: 2*2*2*3*5 or 120

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