Q: Johnny wrote an essay with 150 words. Madeline wrote an essay that was double in length, and Timothy wrote an essay that had 30 words more than Madeline's. If one page contains 260 words, how many pages do Johnny, Madeline, and Timothy's essays fill?
A: Madeline's essay was 150 x 2 = 300 words. Timothy's essay was 300 + 30 = 330 words. All together, they wrote 150 + 300 + 330 = 780 words. Their essays fill 780 / 260 = 3 pages. The answer is 3.

Q: John buys 500 newspapers. Each newspaper sells for $2. He sells 80% of them. He buys them all for 75% less than the price at which he sells them. How much profit does he make?
A: He sells 500 * .8 = 400 newspapers. He sells them for 400 * 2 = $800. He gets a discount of 2 * .75 = $1.5 on the newspapers. So he buys them for 2 - 1.5 = $.5. So he spent 500 * .5 = $250 buying them. That means he made a profit of 800 - 250 = $550. The answer is 550.

Q: Mary is building a mosaic for her school cafeteria's wall. It will be 10 feet tall and 15 feet long. Each tile she uses is 1 inch square. How many tiles will she need?
A:
First convert the length of the mural to inches: 15 feet * 12 inches / foot = 180 inches. Then convert the height of the mural to inches: 10 feet * 12 inches / foot = 120 inches. Then multiply the length and the height to find the total area of the mural: 180 inches * 120 inches = 21600 square inches. Since each tile is 1 square inch, this is also the number of tiles she needs. The answer is 21600.