My question is: Winston had 10 gallons of gas in his car’s gas tank. He drives to the store and uses 6 gallons of gas. Then he drives to the doctor’s office and uses 2 gallons of gas. If the tank can hold up to 12 gallons of gas, how many gallons of gas will Winston need to refill the entire tank? Your thoughts:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
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After driving to the store and doctor’s office, Winston has 10 - 6 - 2 = 2 gallons of gas left in the tank. To refill the entire tank, Winston needs 12 - 2 = 10 gallons of gas. The final answer: 10.