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6 April, 07:36

A library has 142 CDs on its shelves. There are 11 shelves that have 8 CDs on each shelf. The rest of the shelves have 6 CDs on each shelf. How many shelves have 6 CDs?

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Answers (2)
  1. 6 April, 07:50
    0
    11x8=88

    142-88=54

    54 divided by 6 is 9

    So 9 is the answer.
  2. 6 April, 08:49
    0
    11 (8) + 6x = 142

    88 + 6x = 142

    Subtract 88 from both sides

    6x = 54

    Divide both sides by 6

    x = 9

    9 shelves have 6 CD's
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