SOLUTION: What quantity of 70 per cent acid solution must be mixed with a 20 percent solution to produce 700 mL of a 50 per cent solution?

SOLUTION: What quantity of 70 per cent acid solution must be mixed with a 20 percent solution to produce 700 mL of a 50 per cent solution?

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Question 156527: What quantity of 70 per cent acid solution must be mixed with a 20 percent solution to produce 700 mL of a 50 per cent solution?
Answer by checkley77(12844) (Show Source): You can put this solution on YOUR website!
.7X+.2(700-X)=.5*700
.7X+140-.2X=350
.5X=350-140
.5X=210
X=210/.5
X=420 mL OF 70% IS USED.
700-420=280 mL of 20% is used.
Proof:
.7*420+.2*280=.5*700
294+56=350
350=350

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