How do I do this?

Question

Ethanol fuel mixtures have "

E

" numbers that indicate the percentage of ethanol in the mixture by volume. For example, E

10

 is a mixture of 10%

 ethanol and 90%

 gasoline. How much E

6

 should be mixed with 4500

 gal of E

10

 to make an E

9

 mixture?

Answer 1

E represents the amount of 60%

0.06E + 0.10(5400) = 0.09(E + 4500)

Can you solve for E and answer?