SOLUTION: how much of a 15 vinegar solution should be added to a 35% vinegar soultion to make 12 liters of a 20% vinegar soultion?

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Question 1156789: how much of a 15 vinegar solution should be added to a 35% vinegar soultion to make 12 liters of a 20% vinegar soultion?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
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how much of a 15 % vinegar solution should be added to a 35% vinegar soultion solution to make 12 liters of a 20% vinegar soultion solution?
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Add v liters of 15%;

15v%2B35%2812-v%29=20%2A12
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15v%2B35%2A12-35%2Av=20%2A12
-35v%2B15v%2B35%2A12=20%2A12
%2815-35%29v=20%2A12-35%2A12
%2835-15%29v=12%2835-20%29
highlight_green%28v=12%28%2835-20%29%2F%2835-15%29%29%29
v=12%2A%2815%2F20%29
v=12%283%2F4%29
highlight%28v=9%29

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9 liters of the 15%
3 liters of the 35%
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