Alexander B. answered • 09/10/16

PhD in Engineering with 20 yrs of Math and Science Teaching Experience

As per the problem definition, 4500 gal of E10 contains 450 gal of ethanol. Assuming the volume X of E2 has been added, the following equation leads to the solution:

(0.02X + 450) / (X + 4500) = 0.08

Simplify:

0.02X + 450 = 0.08X + 4500 * 0. 08

0.06X = 450 -360

**X= 1500**

You may also refer to the online equation solver to check the answer: http://examn8.com/LinearEquations.aspx