Question: A 20 person classroom is filled with 40% girls. If 5 new boys join the classroom, what is the new percentage of girls in the class?
Answer: The number of girls in the classroom is 20 * 40% = 8 girls. Before new boys join, the number of boys in the classroom is 20 - 8 = 12 boys. If 5 new boys join, the new number of boys is 12 + 5 = 17 boys and the new total is 20 + 5 = 25 total people. The new percentage of girls in the class is 8 girls / 25 total people = 32%. The answer is 32.
[Question]Justin can run 2 blocks in 1.5 minutes. If he is 8 blocks from home, in how many minutes can he run home?
[Answer]There are 8 / 2 = 4 sets of two blocks that Justin can run. Thus, he can run home for 4 x 1.5 = 6 minutes. The answer is 6.
Q: If it takes 8 days for 3 builders to build a cottage. How long will it take 6 builders to build the same size cottage working at the same rate?
A: It would take one builder 8 x 3 = 24 days to build the cottage on his own. 6 builders can build the house in 24 / 6 = 4 days. The answer is 4.
Question: Jason bought a new bookcase that can hold a maximum of 80 pounds of weight. Jason has 70 hardcover books that each weigh half a pound, 30 textbooks that each weigh 2 pounds, and 3 knick-knacks that each weight 6 pounds. How many pounds over the bookcase's weight limit is this total collection of items?
Answer: First find the total weight of the hardcover books: 70 books * .5 pound / book = 35 pounds. Then find the total weight of the textbooks: 30 books * 2 pounds / book = 60 pounds. Then find the total weight of the knick - knacks: 3 knick - knacks * 6 pounds / knick - knack = 18 pounds. Then find the total weight of all the items: 35 pounds + 60 pounds + 18 pounds = 113 pounds. Then subtract the bookcase's weight limit: 113 pounds - 80 pounds = 33 pounds. The answer is 33.
[Question]Jack orders 3 sandwiches that cost $5 each. He pays with a $20 bill. How much does he get in change?
[Answer]The cost was 3 * 5 = $15. So he got 20 - 15 = $5 in change. The answer is 5.
[Question]Matthew drinks 4 glasses of water per day. Each glass is 5 ounces. He decides to just buy a 35 ounces water bottle. How many times will he fill it each week?
[Answer]
He drinks 20 ounces of water a day because 4 x 5 = 20. The drinks 140 ounces in a week because 7 x 20 = 140. He will fill it up 4 times because 140 / 35 = 4. The answer is 4.