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9 June, 18:25

Mark went to an electronic store, purchased 2 CDs and 6 DVDs, and spent $156. Antonio went to the same store, bought 1 CD and 9 DVDs, and spent $210. How much does each CD sell for at the store? $12

$15

$18

$22

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Answers (1)
  1. 9 June, 18:47
    0
    For the answer to the question above,

    Let C be CD's

    Let D be DVD's

    2C + 6D = 156

    C + 9D = 210

    6D = 156 - 2C

    3D = 78 - C

    C + 9D = 210

    C + 3 (78 - C) = 210

    C + 234 - 3C = 210

    234 - 210 = 3C - C

    24 = 2C

    12 = C

    The cost of one CD is $12, so the answer is a.
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