Answer the following question.
Four kids can wash three whiteboards in 20 minutes. How long would it take, in minutes, for one kid to wash six whiteboards?
Step-by-step reasoning process: One kid can wash three whiteboards in 20 * 4 = 80 minutes. One kid can wash six whiteboards in 80 * (6 / 3) = 160 minutes.
The answer is 160.

Answer the following question.
Carl wants to buy a new coat that is quite expensive. He saved $25 each week for 6 weeks. On the seventh week, he had to use a third of his saving to pay some bills. On the eighth week, his dad gave him some extra money for him to buy his dream coat. If the coat cost $170, how much money did his dad give him?
Step-by-step reasoning process: Carl saved in 6 weeks $25 / week x 6 weeks = $150. On the seventh week, he ended up having to pay in bills $150 / 3 = $50. His savings were then $150 - $50 = $100. His dad gave him $170 – $100 = $70.
The answer is 70.

Answer the following question.
Lara bought 52 stems of flowers at the flower shop. She gave 15 flowers to her mom and gave 6 more flowers than she gave to her mom to her grandma. She put the rest in a vase. How many stems of flowers did Lara put in the vase?
Step-by-step reasoning process: Lara gave 15 + 6 = 21 stems of flowers to her grandma. She gave away 21 + 15 = 36 stems of flowers. Therefore, Lara put 52 - 36 = 16 stems of flowers in the vase.
The answer is 16.

Answer the following question.
Adam goes to a small school, which teaches 80 students in three classes. 40% of the students are in class A, and class B has 21 students fewer than class A. The rest are in class C. How many students are in this class?

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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Step-by-step reasoning process: In class A, there are 40 / 100 * 80 = 32 students. In class B, the number of students is less by 21, which means class B has 32 - 21 = 11 students. That means 80 - 32 - 11 = 37 students are in class C.
The answer is 37.