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28 December, 15:17

The ratio of red jelly beans to yellow is 3:4. If greg eats 3 red and 6 yellow, the ratio is 4:5. How many yellow jelly beans were originally in the dish?

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  1. 28 December, 15:27
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    Red = X

    Yellow = Y

    X:Y = 3:4

    X-3: Y-6 = 4:5

    1. 3Y = 4X - > Y = 4/3X

    2. 4 * (Y-6) = 5 * (X-3)

    3. 4Y - 24 = 5X - 15

    4. 4*4/3X - 24 = 5X - 15

    5. 16/3X - 24 = 5X - 15

    6. 16X - 72 = 15X - 45

    7. X = 27. So, Y = 36
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