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View Full Version : Solving it


shines14
Sep 3, 2008, 05:19 PM
How many liters of an 18% alcohol solution must be added to a 10% alcohol solution to get 20 L of a 15 alcohol solution

galactus
Sep 3, 2008, 07:05 PM
You can set this up with one or two equations. I prefer one... less work.

Let x=the amount of 18% to be added.

Then, the amount of 10% is what remains of the 20 L not taken up by the 18%, so we have 20-x.

So, we have .18x+.10(20-x)=.15(20)

Solve for x.

See how to do these now.