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math

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DQ sells 6 times as many orders of french fries as sonic everyday. If both sold 60 more orders DQ would only sell 3 times as many fries. How many do each sell before and after the incease?

  • math -

    S = number FF Sonic sells.
    D = number FF DQ sells.
    ===========================
    D = 6S every day.
    If each sells 60 more, then
    D + 60 = 3(S + 60) or
    D + 60 = 3S + 120 or
    D = 3S + 120
    =========================
    The two equators are as follows:
    D = 6S
    D = 3S + 120
    Solve these two simultaneous equation for D and S (before the addition of 60), then add 60 to each to determine the number sold after adding 60 to each. Post your work if you get stuck.

  • math -

    Where did the 120 come from?

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