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The cost of an order of 10 computer disks and 3 packages of paper was $27. The next order was for 30 disks and 5 packages, and the cost was $65. Find the cost of a single disk and a single package of paper.

  • Math -

    10d + 3p = 27
    30d + 5p = 65

    from the first, we see

    30d + 9p = 81

    so, subtracting, we see that

    4p = 16
    so, d=2.50

  • Math -

    the professor answer for the disk is $1.50 who's right?

  • Math -

    well, I see I was wrong. Could you not check my answer?

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