SOLUTION: how many grams of a 20% sulfuric acid solution must be mixed with 20 grams of a 35% sulfuric acid solution to make a 26% solution?

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Question 600388: how many grams of a 20% sulfuric acid solution must be mixed with 20 grams of a 35% sulfuric acid solution to make a 26% solution?
Answer by alicealc(293) About Me  (Show Source):
You can put this solution on YOUR website!
let 20% sulfuric acid = x grams

20/100 * x + 35/100 * 20 = 26/100 * (x + 20)
0.2x + 7 = 0.26*(x + 20)
0.2x + 7 = 0.26x + 5.2
7 - 5.2 = 0.26x - 0.2x
1.8 = 0.06x
x = 1.8/0.06 = 180/6 = 30

so the 20% sulfuric acid needed is 30 grams