SOLUTION: Pure acid is to be added to a 10% acid solution to obtain 90L of 27% solution. How many Liters of 100% pure acid should be used to make the solution

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Question 763249: Pure acid is to be added to a 10% acid solution to obtain 90L of 27% solution. How many Liters of 100% pure acid should be used to make the solution
Answer by lwsshak3(11628) About Me  (Show Source):
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Pure acid is to be added to a 10% acid solution to obtain 90L of 27% solution. How many Liters of 100% pure acid should be used to make the solution.
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let x=amt of pure acid to be used
90-x=amt of 10% acid solution
..
100%x+10%(90-x)=27%*90
x+9-.1x=24.3
.9x=15.3
x=17
amt of pure acid to be used=17 Liters