Question: There are 400 students in a local high school. 50 percent are freshmen or sophomores. 1/5 of freshmen and sophomores own a pet. How many freshmen and sophomores do not own a pet?
Answer: Freshman / Sophomores:400(.50) = 200 students. Have pets:200 / 5 = 40 students. 200 - 40 = 160 do not have pets. The answer is 160.
[Question]James pays $1000 for advertising. It brought 100 customers to his site and 80% of those bought something at the store that cost $25. How much profit does he gain from the ad?
[Answer]100 * .8 = 80 customers bought something. That means they were worth 80 * 25 = $2000. So he gained 2000 - 1000 = $1000 from the ad. The answer is 1000.
Q: Jo reads at a steady pace. Her current book has 210 pages. Now, she is at page 90. An hour ago, she was at page 60. For how many hours will she be reading the book?
A: She reads 90 - 60 = 30 pages in an hour. She needs to read 210 - 90 = 120 more pages. For an additional 120 pages, she will need 120 / 30 = 4 hours. The answer is 4.
Question: Alice wants 1000 folded paper cranes. She folds half by herself, and a friend folds a fifth of the remaining paper cranes for her. How many paper cranes does Alice still need to fold?
Answer: Alice folds 1000 * 0.5 = 500 paper cranes by herself. This leaves 1000 – 500 = 500 paper cranes left to fold. A friend folds a fifth of the remaining amount, so they have folded 500 / 5 = 100 paper cranes for her. This means there is a total of 1000 – 500 – 100 = 400 paper cranes left for Alice to fold. The answer is 400.
[Question]Wendy works at a chocolate factory packing chocolates. She can package 2 dozen chocolates in 5 minutes. How many individual chocolates can she package in 4 hours?
[Answer]There are 60 minutes in an hour and she packs chocolate in 5 - minute increments. So that's 60 / 5 = 12 5 minute increments in 1 hour. 12 chocolates make 1 dozen and she packages 2 dozen in 5 minutes so that's 12 * 2 = 24 chocolates in 5 minutes. 12 5 minute increments are in an hour and she packages 24 chocolates in 5 minutes so she can package 12 * 24 = 288 individual chocolates in 1 hour. If she packages 288 individual chocolates in 1 hour then in 4 hours she can package 288 * 4 = 1,152 individual chocolates. The answer is 1152.
[Question]Ned is an explosives specialist racing to deactivate a time bomb on the top floor of a building. The building has twenty flights of stairs to the top floor, and Ned can run up one flight of stairs in eleven seconds. The time bomb has 72 seconds left on the timer, and Ned has spent 165 seconds running up the stairs. How many seconds will Ned have to diffuse the bomb when he reaches it?
[Answer]
Ned has gone up 165 / 11 = 15 flights of stairs. Thus, he has 20 - 15 = 5 flights of stairs left to run up. He will spend 5 * 11 = 55 seconds running up the remaining stairs to the bomb. Therefore, he will have 72 - 55 = 17 seconds to defuse the bomb. The answer is 17.