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21 March, 10:30

Marvin is comparing two different music websites. Website A charges $10 per month for a subscription and $0.25 per song. Website B has no subscription fee, and all songs cost $0.75. Which equation would you solve to find the number of songs, s, that Marvin would have to buy each month to make the costs of the music websites equal?

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  1. 21 March, 10:37
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    Website A:

    c = 10 + 0.25 s

    where c is the cost and s is the number of songs.

    Website B:

    c = 0.75 s

    The equation (answer):

    10 + 0.25 s = 0.75 s

    We can solve this equation:

    10 = 0.5 s

    s = 10 : 0.5

    s = 20 (Marvin would have to buy 20 songs to to make the costs equal)
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