First step is to convert gallons to liters. The equation would be 1.5(3.785) = x. Solve for x, so that you convert 1.5 gallons to liters, equaling 5.6775 liters. Then, you convert liters to milliliters. 5.6775 liters = 5677.5 milliliters. The answer is the third answer, 5677.5 ml.
