SOLUTION: What quantity of 70 percent acid solution must be mixed with a 20 percent solution to produce 900 mL of a 50 percent solution?

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Question 363297: What quantity of 70 percent acid solution must be mixed with a 20 percent solution to produce 900 mL of a 50 percent solution?
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
0.70x%2B+0.20%28900-x%29+=+0.50%2A900,
0.70x+%2B+180+-+0.20x+=+450,
0.50x+=+270,
x+=+540mL, the amount of 70% solution that must be added.