SOLUTION: if you have 40 gallons of an antifreeze solution at 80% antifreeze how much water do you need to make it 50%

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Question 318275: if you have 40 gallons of an antifreeze solution at 80% antifreeze how much water do you need to make it 50%
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Let X be the amount of water (0% antifreeze) you add,
80%2840%29%2B0%28X%29=50%2840%2BX%29
3200=2000%2B50X
1200=50X
highlight%28X=24%29
Add 24 gallons of water.