Math

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The ratio of red jelly beans to yellow ones is 3:4. If I eat 3 red ones and 6 yellow ones, the ratio is 4:5. How many yellow ones to begin with?

  • Math -

    number of reds ---- 3x
    number of yellows -- 4x

    (3x-3)/(4x-6) = 4/5
    16x - 24 = 15x - 15
    x = 9

    number of reds at the start = 3(9) = 27
    number of yellows at the start = 4(9) = 36

    check: origianl ratio = 27/36 = 3/4
    after "eating" ratio = 24/30 = 4/5

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