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21 February, 00:59

A store sold 8/5 as many dvd's as cd's. the total number of dvd's and cds sold tha day was 273. how many dvd's were sold

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  1. 21 February, 01:14
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    If we call the number of DVDs x and the number of CDs y we can form two equations.

    x=8/5*y and x+y=273

    5x=8y and x=273-y

    Now if we sub 273-y for x in the first equation:

    5 (273-y) = 8y

    1365=13y

    y=105

    x=273-105

    x=168

    168 DVDs were sold
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