[Question]At a pool party, there are 4 pizzas cut into 12 slices each. If the guests eat 39 slices, how many slices are left?
[Answer]There's a total of 4 x 12 = 48 slices. After the guests eat, there are 48 - 39 = 9 pieces. The answer is 9.
Q: Matt's protein powder is 80% protein. He weighs 80 kg and wants to eat 2 grams of protein per kilogram of body weight each day. How much protein powder does he need to eat per week?
A: He wants to eat 80 * 2 = 160 grams of protein a day. That means he needs 160 / .8 = 200 grams of protein per day. So he needs 200 * 7 = 1400 grams per week. The answer is 1400.
Question: Under standard growth conditions, the bacterial strain, E.coli, has a doubling time of 20 minutes. If 1 single bacterial cell is used to start a culture grown under standard growth conditions, how many bacterial cells will there be after the culture is grown for 4 hours?
Answer: 4 hours is 4 * 60 = 240 minutes. If the doubling time is 20 minutes, then after 240 minutes, the number of bacteria would have doubled 240 / 20 = 12 times. Thus, starting with only 1 bacterial cell, after 4 hours, there will be 1 * 2 * 2 * 2 * 2 * 2 * 2 * 2 * 2 * 2 * 2 * 2 * 2 = 4,096 bacterial cells. The answer is 4096.
[Question]Jenine can sharpen a pencil 5 times before it runs out. She needs to sharpen a pencil for every 1.5 hours of use. She already has ten pencils and needs to write for 105 hours. A new pencil costs $2. How much does she need to spend on more pencils to be able to write for 105 hours?
[Answer]A pencil last 7.5 hours because 5 x 1.5 = 7.5. The pencils she has will last 75 hours because 10 x 7.5 = 75. She needs 30 more hours of writing because 105 - 75 = 30. She will need 4 more pencils to reach this because 30 / 7.5 = 4. She will spend $8 on pencils because 4 x 2 = 8. The answer is 8.
Q: The Dow Jones Industrial Average fell 2% today. The Dow ended the day at 8,722. What was the Dow in the morning before the markets opened?
A: Today the Dow was down 8722 / 98 * 2 = 178. So it started at 8722 + 178 = 8900. The answer is 8900.
Question: One barnyard owl makes 5 hoot sounds per minute. If 5 less than 20 hoots per minute are heard coming out of the barn, how many Barnyard owls would this noise be coming from?
Answer:
5 less than 20 hoots per minute is 20 - 5 = 15 hoots per minute. If one barnyard owl makes 5 hoot sounds per minute, then 15 hoots per minute are coming from 15 / 5 = 3 barnyard owls. The answer is 3.