[Question]Anya washes 32 hairs down the drain when she washes her hair and brushes out half that amount when she brushes it. How many hairs does Anya have to grow back to always have one more hair than she started with after washing, brushing, and growing it?
[Answer]Anya brushes out 32 / 2 = 16 hairs. To always have the same amount of hair, Anya has to grow back 16 + 32 + 1 = 49 hairs. The answer is 49.
Q: Mara has 40 crayons and 10 percent of her crayons are pink. Luna has 50 crayons and 20 percent of them are pink. In total how many pink crayons do Mara and Luna have?
A: Mara has 40 x (10 / 100) = 4 pink crayons. Luna has 50 x (20 / 100) = 10 pink crayons. Together they have 4 + 10 = 14 pink crayons. The answer is 14.
Question: For homework, Juan's teacher asked everyone in the class, to write down the different types of transportation (cars, trucks, bicycles, skateboards etc) they saw on their way home that afternoon. After school, Juan walked home and saw the following: 15 cars, 3 bicycles, 8 pickup trucks and 1 tricycle. How many tires in total were there on the vehicles Juan saw?
Answer: He saw 15 cars and 8 trucks so 15 + 8 = 23 vehicles. Those 23 vehicles have 4 wheels each so 23 * 4 = 92 wheels. Bicycles have 2 wheels each and he saw 3 bikes so 2 * 3 = 6 wheels. Tricycles have 3 wheels each and he saw 1 tricycle so 1 * 3 = 3 wheels. In total, Juan saw 92 + 6 + 3 = 101 wheels. The answer is 101.
[Question]Casey is pumping water out of her well. She can pump 3 gallons a minute. She has 4 rows of 15 corn plants each, and each plant needs half a gallon of water. She also has 10 pigs, which each need 4 gallons of water, and 20 ducks that each need a quarter of a gallon of water. How many minutes does Casey need to spend pumping water?
[Answer]First find how many corn plants there are: 15 plants / row * 4 rows = 60 plants. Then find how many gallons of water of the corn needs: 60 plants * 1 / 2 gallon / plant = 30 gallons. Then find how many gallons of water the pigs need: 10 pigs * 4 gallons / pig = 40 gallons. Then find how many gallons of water the ducks need: 20 ducks * 1 / 4 gallon / duck = 5 gallons. Now add up all three quantities of water to find the total water needed: 5 gallons + 40 gallons + 30 gallons = 75 gallons. Now divide the total water needed by Casey's pumping rate to find how long she spends pumping: 75 gallons / 3 gallons / minute = 25 minutes. The answer is 25.
Q: Julie runs the school newspaper. In preparation for printing the next issue of The School News, she bought two boxes of standard paper, each containing 5 packages, with 250 sheets of paper per package. If this issue of The School News uses 25 sheets of paper to print one newspaper, how many newspapers can Julie print with the paper that she purchased?
A: Five packages per box, with 250 sheets per package is 5 * 250 = 1250 sheets per box. Two boxes contain a total of 1250 * 2 = 2500 sheets. If each newspaper requires 25 pages, then with 2500 sheets she can print 2500 / 25 = 100 newspapers. The answer is 100.
Question: Nick's cell phone was initially empty but was then charged for 45 minutes and has reached a 25% charge. How much longer must the cell phone be charged to reach 100% charge?
Answer:
The ratio between the time charged and the time to be charged is 100 / 25 = 4. To reach 100%, the cell must be charged for 45 minutes * 4 = 180 minutes. Subtracting the 45 minutes that Jimmy already used to charge the cell phone, there are still 180 - 45 = 135 minutes of charging time left. The answer is 135.