Katrina has 120 cookies to sell at her bakery. She plans to take home any cookies she doesn’t sell by the end of the day. In the morning, she sells 3 dozen cookies. During the lunch rush, she sells 57 cookies. In the afternoon, she sells 16 more cookies. How many cookies does she have left to take home? Give the rationale and then the answer.
Let's think step by step. There are 12 cookies in 1 dozen, so in the morning, she sold 12 x 3 dozen = 36 cookies. Throughout the day, she sold 36 cookies in the morning + 57 cookies at lunch + 16 cookies in the afternoon = 109 cookies. She started with 120 cookies – 109 cookies sold = 11 cookies to take home.. The answer is: 11.

A pie shop charges $5 for a slice of pie. They cut each whole pie into 4 slices. How much money will the pie shop make if they sell 9 pies? Give the rationale and then the answer.
Let's think step by step. A pie contains 4 slices so the pie shop makes 5 * 4 = $20 for a pie. If they sell 9 pies, they make 9 * 20 = $180.. The answer is: 180.

Janina spends $30 each day for rent and uses $12 worth of supplies daily to run her pancake stand. If she sells each pancake for $2, how many pancakes must Janina sell each day to cover her expenses? Give the rationale and then the answer.

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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Let's think step by step. Janina spends $30 + $12 = $42 each day for her pancake stand. She must sell $42 / $2 = 21 pancakes each day to cover her expenses.. The answer is: 21.