Question: To buy a book, you pay $20 for each of the first 5 books at the supermarket, and for each additional book you buy over $20, you receive a discount of $2. If Beatrice bought 20 books, how much did she pay at the supermarket?
Answer with step-by-step thinking: For the first five books, the total cost is $20 * 5 = $100. For every additional book over $5, you pay $2 less, totaling to $20 - $2 = $18. Beatrice bought 20 books, so the number of books at which she received the $2 discount is 20 - 5 = 15 books. For the 15 books, Beatrice paid 15 * $18 = $270. In total, Beatrice paid $100 + $270 = $370 for the 20 books.
So the answer is 370.

Question: In a store, there are three types of cheese: white, swiss, and blue cheese. Each cheese is packaged, and there are 200 grams of cheese in each package. The package prices are $5 for white cheese, $6 for swiss cheese, and $8 for blue cheese. Miley needed to get some for her party, and she decided to buy 5 packs of swiss cheese, 600 grams of blue cheese, and one-third less white cheese. How much did she need to pay for all the cheese?
Answer with step-by-step thinking: For the swiss cheese, Miley paid 5 * 6 = $30. 600 grams of blue cheese means 600 / 200 = 3 packages. So for the blue cheese, Miley paid 3 * 8 = $24. One - third of the blue cheese means 1 / 3 * 600 = 200 grams. So Miley bought only 600 - 200 = 400 grams of white cheese. Which means 400 / 200 = 2 packages. So for the white cheese, Miley paid 2 * 5 = $10. So in total for all the cheese, Miley paid 30 + 24 + 10 = $64.
So the answer is 64.

Question: An auctioneer raises the price of an item he is auctioning by $5 every time someone new bids on it. Two people enter a bidding war on a desk and the price goes from $15 to $65 before the desk is sold. How many times did each person bid on the desk?
Answer with step-by-step thinking:
The desk price was raised 65 - 15 = $50. At $5 per bid, there were 50 / 5 = 10 bids on the desk. There were two bidders, so each bid 10 / 2 = 5 times on the desk.
So the answer is 5.