Janessa has a plan to give her brother Dexter his first collection of baseball cards. She currently has 4 cards in addition to the 13 that her father gave her. She ordered a collection of 36 cards from eBay. After inspecting the cards she found 4 cards are in bad shape and decides to throw them away. Janessa ended up giving Dexter 29 cards. How many cards did Janessa keep for herself? Give the rationale and then the answer.
Let's think step by step. Janessa starts with 4 cards + 13 cards = 17 cards. She adds 17 cards + 36 cards = 53 cards from the eBay purchase. Janessa decides to throw away 53 cards - 4 cards = 49 cards due to damage. After giving Dexter the present we know that Janessa kept 49 cards - 29 cards = 20 cards for herself.. The answer is: 20.

Hayes does 3 loads of laundry a week using a detergent pod for each load. His detergent pods come 39 to a pack. How many packs of detergent pods will he need to do a full year of laundry? Give the rationale and then the answer.
Let's think step by step. He uses 3 detergent pods a week and there are 52 weeks in a year, so he uses 3 * 52 = 156. His detergent has 39 pods per pack and he needs 156 pods, so he will need 156 / 39 = 4 packs of detergent pods.. The answer is: 4.

There is a massive rainstorm lasting 4 days. There is an area that collects water to prevent flooding in the area. It ends up overflowing on the 4th day. The area can hold the equivalent of 6 feet of rain. It can also drain out the equivalent of 3 inches of rain per day to the nearby river without causing problems. The first day it rained 10 inches. The second day it rained twice that much. On the third day, it rained 50% more than the second day. It flooded the fourth day before getting a chance to do any of the draining. What is the minimum amount it rained on the fourth day? 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. The second day it rained 10 * 2 = 20 inches. On the third day it rained 20 * 1.5 = 30 inches. So in the first 3 days, it rained 10 + 20 + 30 = 60 inches. It drained 4 - 1 = 3 days. So it drained 3 * 3 = 9 inches. That means on the start of the fourth day, there were 60 - 9 = 51 inches in the pond. The area can hold 6 * 12 = 72 inches. So it rained at least 72 - 51 = 21 inches.. The answer is: 21.