[Question]Mary was working on a research paper and already had borrowed 5 books from the library. 3 books weren't helpful so she returned those and checked out 5 more books. 3 days later, she went back to the library and returned 2 of those books and checked out 7 more books. How many books does Mary currently have checked out of the library?
[Answer]Mary started with 5 books and returned 3 so she had 5 - 3 = 2 books. She had 2 books and checked out 5 more books so she had 2 + 5 = 7 books. She now has 7 books but returned 2 so she has 7 - 2 = 5 books. She had 5 books and checked out 7 more books so she has 5 + 7 = 12 books checked out. The answer is 12.
Q: To produce one chocolate bar, a company needs 1.5 grams of sugar. Every minute the company produces 36 chocolate bars. How many grams of sugar will the company use in two minutes?
A: In one minute the company produces 36 chocolate bars, which means they use 36 * 1.5 = 54 grams of sugar. So in two minutes, the company uses 54 * 2 = 108 grams of sugar to produce chocolate bars. The answer is 108.
Question: Kevin has a tree growing in his garden that is currently 180 inches tall. That is 50% taller than it was when he planted it there. How tall was the tree, in feet, then?
Answer: Since it is 50% taller, then 180 inches is 100% + 50% = 150% of its height then. So each 1% is equal to 180 / 150 = 1.2 inches. So, its height then was 1.2 x 100% = 120 inches. Since 1 foot is equal to 12 inches, then 120 inches is equal to 120 / 12 = 10 feet. The answer is 10.
[Question]Bobby can deadlift 300 pounds at 13. When he is 18 he can deadlift 100 pounds more than 250% of his previous deadlift. How many pounds did he add per year?
[Answer]His new deadlift is 300 * 2.5 + 100 = 850 pounds. So he added 850 - 300 = 550 pounds to his deadlift. This took 18 - 13 = 5 years. So he added 550 / 5 = 110 pounds per year. The answer is 110.
Q: For every bike Henry sells, he is paid $8 more than he is paid to paint the bike. If Henry gets $5 to paint the bike, how much does he get paid to sell and paint 8 bikes?
A: Henry gets paid 5 + 13 = $18 for each bike painted and sold. In total, Henry will be paid 8 * 18 = $144 for painting and selling 8 bikes. The answer is 144.
Question: Prudence was starting a cupcake business. She figured that each cupcake cost $0.75 to make. The first 2 dozen that she made burnt and she had to throw them out. The next 2 came out perfectly and she ended up eating 5 cupcakes right away. Later that day she made 2 more dozen cupcakes and decided to eat 4 more. If she sells the remaining cupcakes at $2.00 each, how much is her net profit?
Answer:
She burnt 2 dozen, cooked 2 dozen and then another 2 dozen that evening. So she made 2 + 2 + 2 = 6 dozen cupcakes. Each dozen makes 12 cupcakes, so she made 6 * 12 = 72 cupcakes. She threw away 2 dozen cupcakes, so 2 * 12 = 24 cupcakes. She made 72, threw away 24, ate 5 and then ate another 4 so she had 72 - 24 - 5 - 4 = 39 cupcakes left. She sells the 39 cupcakes at $2.00 each so she earned 39 * 2 = $78.00. She made 72 cupcakes at a cost of $0.75 each for a total cost of 72 * $0.75 = $54.00. If she made $78 on the remaining cupcakes and it cost her $54.00 to make all of the cupcakes then her profit is $78 - $54 = $24.00. The answer is 24.