SOLUTION: Joseph mixes a certain amount of 10% isopropyl mixture with 60 gallons of a 20% isopropyl solution, and the resulting mixture is 16% isopropyl. How much of the 10% isopropyl did h

Question 221397: Joseph mixes a certain amount of 10% isopropyl mixture with 60 gallons of a 20% isopropyl solution, and the resulting mixture is 16% isopropyl. How much of the 10% isopropyl did he add? To earn credit, you MUST construct an algebraic equation with a variable and solve using algebra steps.
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = gallons of 10% mixture to be added
given:
Iso in 20% mix =
Iso in 10% mix =
-------------------------
In words
(iso in 10% mix)+(iso in 20% mix)/(total gallons of mix) = 16%

He must add 40 gallons of the iso mix
check answer

OK
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