To figure this out, we must first divide the total amount of miles traveled by the miles per gallon.
384 / 32 = 12
After figuring that out, we must subtract the gallons used from the gallons that were in the gas tank before travel.
15 - 12 = 3
Therefore, your final answer is 3 gallons. There is 3 gallons left in the tank.
Hope this helps! :)