SOLUTION: What weight must be added to 50g of 36% sulfuric acid solution to yield a 20% solution? All percents are weight.

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Question 356726: What weight must be added to 50g of 36% sulfuric acid solution to yield a 20% solution? All percents are weight.
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
Let x = # grams of water that has to be added. Then
50%2A0.36+%2B+x%2A0+=+%2850+%2B+x%29%2A0.20,
18+=+10+%2B+0.20x,
8+=+0.20x,
40+=+x. Therefore 40 grams of water has to be added.