math
posted by jenn .
The ratio of yellow paint to blue paint is 3 quarts to make the color green to paint my bathroom. I need a total of quarts of yellow paint. How many quarts of blue paints I need?

How many quarts of yellow paint do you need?

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The ratio of yellow paint to blue paint is 3 quarts to 2 quarts to make the color green to paint my bathroom. I need a total of 12 quarts of yellow paint? 
3/2 = 12/x
Cross multiply and solve for x.