SOLUTION: A chemist needs a 20% solution of alcohol. How many liters of a 10% alcohol solution must be mixed with 90 liters of a 40% solution to get a 20% solution?
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Question 275619: A chemist needs a 20% solution of alcohol. How many liters of a 10% alcohol solution must be mixed with 90 liters of a 40% solution to get a 20% solution? Answer by CharlesG2(834) (Show Source):
You can put this solution on YOUR website! A chemist needs a 20% solution of alcohol. How many liters of a 10% alcohol solution must be mixed with 90 liters of a 40% solution to get a 20% solution?
% in A * amount A + % in B * amount B = % in C * amount C
0.10 * x + 0.40 * 90 = 0.20 * (x + 90)
0.10x + 36 = 0.20x + 18
-0.10x = -18
0.10x = 18
x = 180 liters
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