SOLUTION: how many gallons of gasoline that is 12% ethanol must be added to 2,000 gallons of gasoline without ethanol to get a mixture that is 10% ethanol?

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Question 706986: how many gallons of gasoline that is 12% ethanol must be added to 2,000 gallons of gasoline without ethanol to get a mixture that is 10% ethanol?
Answer by nshah11(47) About Me  (Show Source):
You can put this solution on YOUR website!
Assume x gallons must be added:
(0.12x)/(2000 + x) = 0.1
0.12x = 200 + 0.1
x/50 = 200
x = 10,000 gallons