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hard math

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The jelly Junior school color is made by mixing red paint and yellow paint. The ratio of red to yellow is 3 to 5. How much red paint should be mixed with 20 oz of yellow?

  • hard math -

    You can set up a ratio like this, with x = the amount of red paint:

    3/5 : x/20

    Cross multiply: 5x = 60

    Solve: x = 12

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