SOLUTION: A 10% acid solution is to be mixed with a 50% acid solution in order to get 120oz of 20% acid solution. How much of each solution should be used?

Question 1057725: A 10% acid solution is to be mixed with a 50% acid solution in order to get 120oz of 20% acid solution. How much of each solution should be used?
Answer by addingup(3677) (Show Source): You can put this solution on YOUR website!
Let the amount of 10% acid solution be x.
Then, the amount at 50% will be 120-x
0.10x+0.50(120-x) = 0.2(120)
0.1x+60-0.5x = 24
-0.4x = -36
x = -36/-0.4 divide, remember that -/- = +
x = 90 You need 90 ounces of the 10% solution and 120-90 = 30oz at 50%.
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check:
.1*90+.5*30 = 24 Correct
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