We have 25% solution and a 50% solution of a chemical. How do we mix them to prepare 100 gallons of 40% solution?
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Answer:
Gallons of .25 = N
Gallons of .50 = M
.25 N + .5 M = .4 (N + M)
.1 M = .15 N
M + N = 100
.1 * (100 - N) = .15 N
10 = .25 N
So N = 40 and M = 60
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