SOLUTION: My problem is as follows: How much pure hydrocloric acid must be added to 40 milliliters of a 50% solution to obtain a 75% acid solution?

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Question 486546: My problem is as follows:
How much pure hydrocloric acid must be added to 40 milliliters of a 50% solution to obtain a 75% acid solution?
Answer by lwsshak3(11628) About Me  (Show Source):
You can put this solution on YOUR website!
How much pure hydrocloric acid must be added to 40 milliliters of a 50% solution to obtain a 75% acid solution?
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let x= milliliters of pure hydrocloric acid to be added
100%(x)+50%(40)=75%(x+40)
x+20=.75x+30
.25x=10
x=10/.25=40
ans:
40 milliliters of pure hydrocloric acid must be added to 40 milliliters of a 50% solution to obtain a 75% acid solution?