SOLUTION: a sugar solution was made by mixing 7 qt. of a 15% solution and 4 qt. of a 70% sugar solution. what is the concentration of the mixture?

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Question 624719: a sugar solution was made by mixing 7 qt. of a 15% solution and 4 qt. of a 70% sugar solution. what is the concentration of the mixture?
Answer by lwsshak3(11628) About Me  (Show Source):
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a sugar solution was made by mixing 7 qt. of a 15% solution and 4 qt. of a 70% sugar solution. what is the concentration of the mixture?
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let x= concentration of the mixture
15%*7+70%*4=x*11
11x=1.05+2.8=3.85
x≈3.85/11=.35
concentration of the mixture=35%