alGEBRA 1
posted by sasha .
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

alGEBRA 1 
Ms. Sue
Make a proportion. Let x = lemon juice
3/7 = x/9
Cross multiply and solve for x.
http://www.purplemath.com/modules/ratio4.htm
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