John goes to the bakery to buy rolls. They sell them for 5 dollars for a dozen. He spent 15 dollars. How many rolls did he get?
Let's think: He got 15 / 5 = 3 dozen. So he bought 3 * 12 = 36 rolls.. The answer is: 36.

When Erick went to the market to sell his fruits, he realized that the price of lemons had risen by $4 for each lemon. The price of grapes had also increased by half the price that the price of lemon increased by per grape. If he had planned to sell the lemons at $8 and the grapes at $7, and he had 80 lemons and 140 grapes in his basket, how much money did he collect from selling the fruits at the new prices?
Let's think: The new price for each lemon after increasing by $4 is $8 + $4 = $12. For the 80 lemons, Erick received $12 * 80 = $960. The price of each grape increased by 1 / 2 * $4 = $2. The new price at which Erick sold his grapes is $7 + $2 = $9. For the 140 grapes, Erick collected 140 * $9 = $1260. From the sale of all of his fruits, Erick received $1260 + $960 = $2220.. The answer is: 2220.

James is building a hall of mirrors. Three of the walls will be completed covered with glass. If two of those walls are 30 feet by 12 feet and the third is 20 feet by 12 feet, how many square feet of glass does he need?
Let's think: First find the area of one of the long walls: 30 feet * 12 feet = 360 square feet. Then double that amount since there are two walls: 360 square feet * 2 = 720 square feet. Then find the area of the short wall: 20 feet * 12 feet = 240 square feet. Then add that area to the area of the two long walls to find the total area: 720 square feet + 240 square feet = 960 square feet.. The answer is: 960.

Carla's brush is 12 inches long. If Carmen's brush is 50% longer than Carla's brush, how long is Carmen's brush in centimeters? (There are 2.5 centimeters per inch.)
Let's think:
First find the length of Carmen's brush in inches: 150% * 12 inches = 18 inches. Then convert the length from inches to centimeters: 18 inches * 2.5 centimeters / inch = 45 centimeters.. The answer is: 45.