[Question]A pipe is clogged so that only 2 ounces of cleaner can run through the pipe per minute. After fifteen minutes, the cleaner has unclogged it enough that 3 ounces can run through per minute. Ten minutes later, the clog is cleared enough for 4 ounces to run through per minute. How many ounces of cleaner were used after 30 minutes?
[Answer]For 15 minutes at 2 ounces per minute, 2 * 15 = 30 ounces were used. For the next 10 minutes at 3 ounces per minute, 3 * 10 = 30 ounces were used. There are 30 - 15 - 10 = 5 minutes remaining. For the next 5 minutes at 4 ounces per minute, 4 * 5 = 20 ounces were used. After 30 minutes, 30 + 30 + 20 = 80 ounces of cleaner were used. The answer is 80.
Q: Rachel solved 5 math problems each minute for 12 minutes before bed, but she didn't finish all of them. The next day, she finished the last 16 problems at lunch. How many math problems did she do in all?
A: Before going to bed, Rachel did a total of 5 × 12 = 60 problems. In total Rachel did 60 + 16 = 76 maths problems. The answer is 76.
Question: Carmela has $7 and each of her four cousins has $2. How much will Carmela have to give to each of her cousins so that she and her cousins will have the same amount of money?
Answer: Carmela's four cousins have a total of $2 x 4 = $8. The total money they all have is $7 + $8 = $15. There will be 1 (Carmela) + 4 (cousins) = 5 people who will be sharing equally the money. So each of them should get $15 / 5 = $3. Hence, Carmela has to give a total of $7 - $3 = $4 to her 4 cousins. Therefore, each of her cousins will get $4 / 4 = $1. The answer is 1.
[Question]During a recent three-day trip to Italy, Keziah and her mom went mushroom picking. They sold all the mushrooms they picked on the first day for a total of $58. The day after, they picked 12 mushrooms. On the last day, they picked double the mushrooms they had picked the previous day. If the price per mushroom was $2, what is the total number of mushrooms they picked?
[Answer]Since each mushroom cost $2, on the first day Keziah and her mom picked and sold 58 / 2 = 29 mushrooms. After picking 12 mushrooms on the second day, the cumulative total became 29 + 12 = 41 mushrooms. On the third day, they picked double the previous day, which translates to 2 * 12 = 24 mushrooms. It therefore means that over the three days, Keziah and her mom picked a total of 41 + 24 = 65 mushrooms. The answer is 65.
Q: Jenny wants to heat a dish for dinner. It needs to be at 100 degrees before it is ready to eat. It is 20 degrees when she places it in the oven, and it heats up 5 degrees every minute. How many minutes will it take to be ready?
A: To determine this, we must first figure out the required change in temperature. To do this, we perform 100 - 20 = 80 degrees of required temperature change. Next, we divide this amount by the rate of change per minute, performing 80 / 5 = 16 minutes of cooking time. The answer is 16.
Question: John takes a 10-minute shower every other day for 4 weeks. If his shower uses 2 gallons of water per minute. How much water does he use in those 4 weeks?
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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There are 4 * 7 = 28 days in those 4 weeks. That means he takes 28 / 2 = 14 showers. So he takes a total of 14 * 10 = 140 minutes of showers. So he uses 2 * 140 = 280 gallons of water. The answer is 280.