Question 611231
A dealer has 10,000 gallons of unleaded gasoline.
 He wants to add just enough ethanol to make the fuel a 10% ethanol mixture.
 How many gallons of ethanol should be added?
:
Let x = amt of ethanol
:
x = .10(x+10000)
x = .10x + 1000
x - .1x = 1000
.9x = 1000
x = 1000/.9
x = 1111.11 gal of ethanol required