SOLUTION: 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 311004: How much pure hydrocloric acid must be added to 40 milliliters of a 50% solution to obtain a 75% acid solution?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Let X be the ml of 100% acid added.
50%2840%29%2B100%28X%29=75%2840%2BX%29
2000%2B100X=3000%2B75X
25X=1000
highlight%28X=40%29
40 ml of 100% acid need to be added.