SOLUTION: What quantity of 40% acid solution must be mixed with 120 mL of 90% acid solution to produce 70% acid solution?
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Question 809928: What quantity of 40% acid solution must be mixed with 120 mL of 90% acid solution to produce 70% acid solution?
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
.9*120+.4x=.7(120+x)
9*120+.4x=.7*120+.7x
.2*120=.3x
2*120=3x
2*40=x
80 mL=x
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