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the ratio of lemon juice to water in lemonade is 3:7 ,. if 9 cups of water aer used to make a pitcher of lemonade , how many cups of lemon juice are needed

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Make a proportion. Let x = lemon juice

3/7 = x/9

Cross multiply and solve for x.

http://www.purplemath.com/modules/ratio4.htm

3.86

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