Andy C. answered • 07/23/18

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E5 contains 5% ethanol and 95% gasoline

E10 contains 10% ethanol and 90% gasoline

E9 contains 9% ethanol and 91% gasoline

X is the amount of E5

0.05X + 0.10*5000 = 0.09*(X+5000)

5X + 10(5000) = 9(X + 5000)

5X + 50000 = 9X + 45000

0 = 9X + 45000 - 5x - 50000

0 = 4x - 5000

5000 = 4x

x = 5000/4 = 2500/2 = 1250