Question: Tracy has a charity book collection store from which she receives book donations from members of her town. Any person who wants to borrow a book is free to do so as long as they return the book after they've finished reading. She has already received 300 book donations. If ten people come and donate five books each in a week, and a total of 140 books are borrowed by other people to read, calculate the total number of books she has remaining in the store?
Answer: The ten people donated 10 * 5 = 50 books. The total number of books in her store after the new donations is 300 + 50 = 350 books. When some of the books are borrowed, her total collection becomes 350 - 140 = 210 books. The answer is 210.
[Question]Olga has an aquarium with fish in 5 different colors. There are 12 yellow ones, half as many blue ones, and twice as many green ones as yellow ones. How many fish does Olga have in her aquarium?
[Answer]Olga has half as many blue fish as yellow ones, which means 12 * 0.5 = 6 blue fish. Green fish are twice as many as yellow ones, so in total there are 12 * 2 = 24 green fish. So all the fish sum up to 12 + 6 + 24 = 42. The answer is 42.
Q: Vincent's washer broke so he had to go to the laundromat. On Wednesday he washed six loads of clothes. The next day he had time to wash double the number of loads he did the day before. On Friday he had a test and could only manage half of the loads he did on Thursday. On Saturday the laundromat closed at noon and he could only wash a third of the loads of laundry he did on Wednesday. How many loads of laundry had he washed that week?
A: On Thursday he washed 6 * 2 = 12 loads of laundry. On Friday he washed 12 / 2 = 6 loads of laundry. On Saturday he washed 6 / 3 = 2 loads of laundry. In total he washed 6 + 12 + 6 + 2 = 26 loads of laundry. The answer is 26.
Question: Nicole has three older sisters. After each one outgrows their clothes, they give them to Nicole. They have all outgrown their clothes and have given them all to Nicole. Nicole started with 10 pieces of clothing. Her first older sister had half as many clothes as Nicole. The next oldest sister had 2 more pieces of clothing than Nicole. The oldest had the average of what her three younger sisters had. How many pieces of clothing does Nicole end up with?
Answer: The first sister has 5 pieces of clothing because 10 / 2 = 5. The next sister had 12 pieces of clothing because 10 + 2 = 12. The three youngest sisters combined have 27 pieces because 10 + 5 + 12 = 27. The oldest has 9 pieces because 27 / 3 = 9. Nicole ends up with 36 pieces of clothing because 10 + 5 + 12 + 9 = 36. The answer is 36.
[Question]A mosquito sucks 20 drops of blood every time it feeds on someone. If there are 5000 drops per liter and you have to lose 3 liters of blood to die, how many mosquitoes would have to feed on you to kill you?
[Answer]First find the total number of liters a mosquito sucks in one feeding: 20 drops / 5000 drops / liter = .004 L / feeding. Then divide the lethal amount of blood by the amount of blood one mosquito can drain: 3 L / .004 L / feeding = 750 feedings. The answer is 750.
[Question]Chrystal's vehicle speed is 30 miles per hour. Ascending the mountain decreases its speed by fifty percent, and descending the mountain increases its speed by twenty percent. If the distance going to the top of the mountain is 60 miles and the distance going down to the foot of the mountain is 72 miles, how many hours will Crystal have to pass the whole mountain?
[Answer]
The vehicle's speed decreases to 30 x 0.50 = 15 miles per hour when ascending to the top of the mountain. So, the total time Crystal will have to spend going to the top of the mountain is 60 / 15 = 4 hours. And the speed of the vehicle increases by 30 x 0.20 = 6 miles per hour when going down to the foot of the mountain. So, the total speed of the vehicle when going down is 30 + 6 = 36 miles per hour. Thus, Chrystal will have to spend 72 / 36 = 2 hours to descend from the mountain. Therefore, the total hours she will spend to pass the whole mountain is 4 + 2 = 6 hours. The answer is 6.