SOLUTION: How many liters of a solution containing 18% sulfuric acid and how many litres of another solution containing 25% sulfuric acid must be mixed together to make 550 L of a solution

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Question 1174667: How many liters of a solution containing 18% sulfuric acid and how many litres of another solution containing 25% sulfuric acid must be mixed together to make 550 L of a solution containing 23% sulfuric acid? (All percentages are by volume.) Round to three significant digits.
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!

Hi
 x and (550-x) the amounts of .25 and .18 respectively.

 .25x + .18(550-x) = .23(550)
        .07x = .05(550)
           x = .05(550L)/.07 = 392.857 L of 25% sulfuric acid 
                          and  157.143 L of the  18% sulfuric acid

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