Hannah has three dogs. The first dog eats 1.5 cups of dog food a day. The second dog eats twice as much while the third dog eats 2.5 cups more than the second dog. How many cups of dog food should Hannah prepare in a day for her three dogs?
Let's think: The second dog eats 1.5 x 2 = 3 cups of dog food. The third dog eats 3 + 2.5 = 5.5 cups. So, Hannah should prepare 1.5 + 3 + 5.5 = 10 cups.. The answer is: 10.

Derek has $960 to buy his books for the semester. He spends half of that on his textbooks, and he spends a quarter of what is left on his school supplies. What is the amount of money Derek has left?
Let's think: Amount spent on textbooks is 960 / 2 = 480 dollars. Amount spent on school supplies is 480 / 4 = 120 dollars. Amount Derek has left 960 - 480 - 120 = 360 dollars.. The answer is: 360.

When Betty makes cheesecake, she sweetens it with a ratio of one part sugar to four parts cream cheese, and she flavors it with one teaspoon of vanilla for every two cups of cream cheese. For every one teaspoon of vanilla, she uses two eggs. She used two cups of sugar in her latest cheesecake. How many eggs did she use?
Let's think: Betty used 2 cups of sugar in her cheesecake, so she used 2 * 1 = 2 times her ratio. Thus, she used 2 * 4 = 8 cups of cream cheese. She uses 1 teaspoon of vanilla for 2 cups of cream cheese, so she used 8 / 2 = 4 teaspoons of vanilla. For each teaspoon of vanilla, she uses 2 eggs, so she used 2 * 4 = 8 eggs.. The answer is: 8.

There are twice as many cows in Devonshire as there are hearts on a standard deck of 52 playing cards. If there are 4 hearts on a card, calculate the total cost of the cows when they are sold at $200 each.
Let's think:
If there are 4 hearts on a card, a standard deck of 52 playing cards will have 208 hearts. There are twice as many cows in Devonshire as there are hearts on a standard deck of 52 playing cards, meaning there are 2 * 208 = 416 cows in Devonshire. The total cost of the cows when they are sold at $200 each is 416 * $200 = $83200.. The answer is: 83200.