SOLUTION: You want to mix some 10% glucose solution with some 15% glucose solution to obtain 100 ml of a 12% glucose solution. How much of the 15% glucose solution do you need in the mixture

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Question 730490: You want to mix some 10% glucose solution with some 15% glucose solution to obtain 100 ml of a 12% glucose solution. How much of the 15% glucose solution do you need in the mixture?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
x and y for milliliters of the 10% and the 15% solutions.
%2810x%2B15y%29%2F100=12 AND x%2By=100.
Treat the two equations as a system and solve for x and y.