SOLUTION: How much pure acid must be added to 50ml of 25% acid solution to produce a mixture that is 60% acid

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Question 551707: How much pure acid must be added to 50ml of 25% acid solution to produce a mixture that is 60% acid
Answer by mananth(16946) About Me  (Show Source):
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percent ---------------- quantity
Acid 25 ----------------50 ml
Pure acid 100 ----------------x ml
Mixture 60 ---------------- 50+xml

25*50+100x=60(50+x)
1250+100x=3000+60x
100x-60 x=3000 -1250
40 x = 1750
/ 40
x= 43.75 ml of Pure acid