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13 June, 23:09

A 12-oz cup of regular coffee at Starbucks has 13 times the amount of caffeine found in the same-sized serving of decaffeinated coffee. Together they contain 280 mg of caffeine. How much caffeine is in each type of coffee?

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  1. 14 June, 00:17
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    If the decaffeinated is x, the regular coffee would be 13*x = 13x

    They both total 280 mg.

    x + 13x = 280

    14x + 280

    x = 280/14

    x = 20 mg

    x, and 13x x = 20, 13x = 13*20 = 260

    Decaffeinated has 20 mg and the regular coffee in Starbucks has 260 mg.
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