Question 1155207
Six hundred liters of a solution was available, but the solution was 70% alcohol. 
 Dan needed a solution of 40% alcohol.
 How many liters of alcohol had to be extracted so that the solution would be 40% alcohol?
:
Let x = amt of alcohol to removed
.7(600) - x = .4(600-x)
420 - x = 240 - .4x
420 - 240 = -.4x + x
180 = .6x
x = 180/.6
x = 300 liters of alcohol