Reasoning & answer: CoT: Alone it would take him 9 * 20 = 180 minutes. With his brother, it would take him 12 * 20 = 240 minutes. 240 - 180 = 60 more minutes.
The answer: 60
Question: It takes Derek 9 minutes to walk a mile if he doesn't have to walk with his brother. If he has to take his brother it takes 12 minutes to walk a mile. How many minutes longer would it take him to walk 20 miles if he had to take his brother?

Reasoning & answer: CoT: On Saturday, he served 3 times the amount of customers that he served on Friday, which was 28 customers so he served 3 * 28 = 84 customers. He served 28 customers on Friday, 84 on Saturday and 36 customers on Sunday for a total of 28 + 84 + 36 = 148 customers. Each customer tipped him $2.00 and he had 148 customers so he made 2 * 148 = $296.00.
The answer: 296
Question: Wade has a hot dog food truck. He makes $2.00 in tips per customer. On Friday he served 28 customers. He served three times that amount of customers on Saturday. On Sunday, he served 36 customers. How many dollars did he make in tips between the 3 days?

Reasoning & answer: CoT: He buys 4 * 30 = 120 stickers. That means it cost 120 * .1 = $12. So he pays 12 * .5 = $6.
The answer: 6
Question: James splits 4 packs of stickers that have 30 stickers each. Each sticker cost $.10. If his friend pays for half how much did James pay?

Reasoning & answer: CoT: The amoeba will divide into 1 * 2 = 2 amoebae after 2 days. The amoeba will divide into 2 * 2 = 4 amoebae after 4 days. The amoeba will divide into 4 * 2 = 8 amoebae after 6 days. The amoeba will divide into 8 * 2 = 16 amoebae after 8 days.
The answer: 8
Question:

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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An amoeba reproduces by fission, splitting itself into two separate amoebae. An amoeba reproduces every two days. How many days will it take one amoeba to divide into 16 amoebae?