A 6-liter solution is 25% alcohol. How many liters of pure alcohol must be added to produce a solution that is 50% alcohol?  Choose one
A) 2.1 B) 2.4 C) 2.7 D) 3.0 E) 3.3
Let x be the amount of pure alcohol required.   0.25(6) + x = 0.5(x+6)   0.5x = 3 - 1.5   x = 3 liters   The answer is 3.0.
<result>D</result>
A 6-liter solution is 25% alcohol. How many liters of pure alcohol must be added to produce a solution that is 50% alcohol?