Each purple book has 230 pages. Each orange book contains 510 pages. Mirella read 5 purple books and 4 orange books. How many more orange pages did she read than purple pages? Give the rationale and then the answer.
Let's think step by step. Purple = 5 * 230 = 1150 pages. Orange = 4 * 510 = 2040 pages. 2040 - 1150 = 890. Mirella read 890 more orange pages than purple pages.. The answer is: 890.

To raise funds for her local soup kitchen, Didi enlisted the help of her family, friends, and neighbors. They donated 10 same-size cakes that she sliced into 8 slices per cake and started selling a slice for $1. A local business owner was so impressed by Didi's efforts that she offered to donate 50 cents for each slice Didi sold. A second business owner also offered to donate a quarter for each slice sold. If Didi sold all the slices, how much money did she raise? Give the rationale and then the answer.
Let's think step by step. All the cakes yielded 10 * 8 = 80 slices. Since Didi was selling each slice for $1, it means she sold everything for 80 * 1 = 80 dollars. The first business owner donated 50 / 100 * 80 = 40 dollars. The second business owner donated 25 / 100 * 80 = 20 dollars. Adding both amounts gives 80 + 40 + 20 = 140 dollars.. The answer is: 140.

For homework, Brooke has 15 math problems, 6 social studies problems, and 10 science problems. He can answer each math problem for 2 minutes while answering each social studies problem takes him 30 seconds. If he can answer each science problem in 1.5 minutes, how long will it take Brooke to answer all his homework? 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. Brooke will take 15 x 2 = 30 minutes to answer all math problems. It will take him 6 x 30 seconds = 180 seconds to answer all social studies problems. In minutes, this is equal to 180 / 60 = 3 minutes. It will take him 10 x 1.5 minutes = 15 minutes to answer all science problems. Therefore, Brooke will take 30 + 3 + 15 = 48 minutes to finish his homework.. The answer is: 48.