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24 October, 21:50

Carol puts some green cubes and red cubes in a box. The ratio is 2:1. She adds 12 more cubes to the red cubes in the box and the ratio becomes 4:5. How many green cubes were in the box?

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  1. 24 October, 22:56
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    16 green cubes are in the box.

    Step-by-step explanation:

    No. of red cubes at first (x):

    4 (x + 12) = 5 (2x)

    4x + 48 = 10x

    6x = 48

    x = 8

    No. of green cubes:

    = 8 * 2

    = 16

    Answer: 16 green cubes are in the box.

    20 red cubes are in the box in the end.

    Proof (the ratio in the end is 4:5):

    = 16 is to 20

    = 16/4 is to 20/4

    = 4 is to 5
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