Q: The total number of books on four shelves, with 400 books each, is the same as the distance in miles that Karen bikes back to her home from the library. Calculate the total distance that Karen covers if she bikes from her home to the library and back.
A: If each shelf has 400 books, then the four shelves have 4 * 400 = 1600 books. Since the total number of books on the shelves is the same as the distance that Karen bikes back home, biking to and from the library takes 1600 + 1600 = 3200 miles. The answer is 3200.
Question: Anya washes 32 hairs down the drain when she washes her hair and brushes out half that amount when she brushes it. How many hairs does Anya have to grow back to always have one more hair than she started with after washing, brushing, and growing it?
Answer: Anya brushes out 32 / 2 = 16 hairs. To always have the same amount of hair, Anya has to grow back 16 + 32 + 1 = 49 hairs. The answer is 49.
[Question]Otto’s local kitchen supply store charges $5.00 for the first knife that you need sharpened. They charge $4.00 for the next 3 knives and $3.00 for any knife after that. If Otto has 9 knives that need to be sharpened, how much will it cost to sharpen his knives?
[Answer]Knives 2, 3 & 4 will cost $4.00 each to sharpen so that’s 3 * 4 = $12.00. Knives 5 - 9 will cost $3.00 each to sharpen so that’s 5 * 3 = $15.00. The first knife will cost $5.00, the next 3 cost $12.00 and the rest cost $15.00 for a total of 5 + 12 + 15 = $32.00. The answer is 32.
Q: If you double a number and add 5 to the result, then that's 20 more than half of the original number. What's the original number?
A: Let x be the original number. 2 * x + 5 = 20 + x / 2. 2 * x - x / 2 = 15. 4 * x - x = 30. 3 * x = 30. x = 10. The answer is 4.
Question: Maynard's dog dug 8 holes in the lawn. Maynard filled in 75% of the hole with dirt. How many holes remain unfilled?
Answer: 75% of the 8 holes in Maynard's lawn, or (75 / 100) * 8 = 6 holes, were filled in with dirt. Of the original 8 holes, 8 - 6 = 2 holes remain unfilled. The answer is 2.
Q: Rob and Mark plan to meet at the national park. It takes 1 hour for Rob to get to the national park and it takes three times as much time for Mark to get to the national park. If Rob leaves his home at 11 a.m., at what time should Mark leave his home so that they both arrive at the same time?
A:
It takes 1 hour * 3 = 3 hours for Mark to get to the national park. The extra time it takes Mark to get to the national park is 3 hours - 1 hour = 2 hours. Mark should leave his home at 11 a.m. - 2 hours = 9 a.m. The answer is 9.