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17 October, 17:32

A tape costs $4 less than the CD. Okasha bought 1 CD in five tapes. If the total cost was $70 what was the price of the CD?

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  1. 17 October, 21:14
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    C + 5t = 70

    t = c - 4

    c + 5 (c - 4) = 70

    c + 5c - 20 = 70

    6c - 20 = 70

    6c = 70 + 20

    6c = 90

    c = 90/6

    c = 15 < = = = cost of a CD

    t = c - 4

    t = 15 - 4

    t = 11 ... cost of a tape
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