Two pieces of bread are needed for one regular sandwich. 3 pieces of bread are needed for a double meat sandwich. How many pieces of bread are needed for 14 regular sandwiches and 12 double meat sandwiches? Let's think first. Chain of thought:

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.
user
Regular = 2 * 14 = 28 pieces. Double = 3 * 12 = 36 pieces. 28 + 36 = 64 pieces. 64 pieces of bread are needed for those sandwiches.
Therefore, the answer is 64.