SOLUTION: You need a 85% alcohol solution. On hand, you have a 90 mL of a 25% alcohol mixture. How much pure alcohol will you need to add to obtain the desired solution? You will need

Question 522145: You need a 85% alcohol solution. On hand, you have a 90 mL of a 25% alcohol mixture. How much pure alcohol will you need to add to obtain the desired solution?
You will need
mL of pure alcohol
to obtain
mL of the desired 85% solution.
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
--------percent ---------------- quantity
Alcohol Type I 25 ---------------- 90 ml
Pure alcohol 100 ---------------- x ml
Mixture 85 ---------------- 90 + x ml

25 *90+100x=85( 90+x)
2250+100x=7650+ 85 x
100x-85 x = 7650 - -2250
15 x = 5400
/ 15
x = 360
360 ml of Pure alcohol

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