# How many gallons of a 60​% antifreeze solution must be mixed with 60 gallons of 20​% antifreeze to get a mixture that is 50​%​antifreeze? Use the​ six-step method. You need ________gallons.   ​(Round to the nearest whole​ number.)

Question
How many gallons of a 60​% antifreeze solution must be mixed with 60 gallons of 20​% antifreeze to get a mixture that is 50​%
​antifreeze? Use the​ six-step method.
You need ________gallons.

​(Round to the nearest whole​ number.)