[Question]Simon and Peter have a big stamp collection. Simon collects red stamps and Peter collects white stamps. Simon has 30 red stamps and Peter has 80 white stamps. If the red stamps are then sold for 50 cents each and the white stamps are sold for 20 cents each, what is the difference in the amount of money they make in dollars?
[Answer]Red stamps are 50 cents each and for 30 stamps, Simon would get 50 * 30 = 1500 cents. White stamps are 20 cents each and for 80 stamps, Peter would get 20 * 80 = 1600 cents. The difference in cents is 1600 - 1500 = 100 cents. One dollar equals 100 cents, so the difference in dollars is 100 / 100 = $1. The answer is 1.
Q: Arlene hiked 24 miles on Saturday, carrying a 60-pound backpack. She is exactly 5 feet tall. She spent 6 hours hiking. The temperature during the day was 60 degrees Fahrenheit. What was Arlene's average hiking pace, in miles per hour?
A: She hiked 24 miles. She spent 6 hours hiking. Her average pace was 24 / 6 = 4 mph. The answer is 4.
Question: Nora's mother tells her to go and pick oranges from their farm. She picks 80 oranges from one tree, 60 from another tree, and 120 from the third tree. What's the total number of oranges she picked?
Answer: After picking 80 oranges from the first tree and 60 oranges from the second tree, she has 80 + 60 = 140 oranges. When she adds 120 more oranges from the third tree, she has 140 + 120 = 260 oranges. The answer is 260.
[Question]Four kids can wash three whiteboards in 20 minutes. How long would it take, in minutes, for one kid to wash six whiteboards?
[Answer]One kid can wash three whiteboards in 20 * 4 = 80 minutes. One kid can wash six whiteboards in 80 * (6 / 3) = 160 minutes. The answer is 160.
Q: Martha needs to paint all four walls in her 12 foot by 16 foot kitchen, which has 10 foot high ceilings. Each wall needs one coat of primer and two coats of paint. If Martha can paint 40 square feet per hour, how many hours will it take her to paint the kitchen?
A: There are two walls that are 12' X 10' and two walls that are 16' by 10'. First find the size in square feet of one 12' x 10' wall by multiplying the height and length: 12 ft * 10 ft = 120 sq ft. Multiply that quantity by 2 since there are two 12' x 10' walls: 120 sq ft * 2 = 240 sq ft. Then find the size in square feet of one 16' x 10' wall by multiplying the height and length: 16 ft * 10 ft = 160 sq ft. Multiply that quantity by 2 since there are two 16' x 10' walls: 160 sq ft * 2 = 320 sq ft. Now add the square footage of both sets of walls to find the total square footage Martha needs to paint: 240 sq ft + 320 sq ft = 560 sq ft. Now multiply that amount by 3 because Martha needs to add 3 coats: 560 sq ft / coat * 3 coats = 1680 sq ft. Finally, divide the total square footage by Martha's painting rate to find how many hours she needs to finish: 1680 sq ft / 40 sq ft / hour = 42 hours. The answer is 42.
Question: Jennifer is building tanks to hold her goldfish. She built 3 tanks that will hold 15 fish each, heated, and filled them. She plans to build the rest of the tanks equipped with heaters, and they will hold 10 fish each. If she needs to build enough tanks to house a total of 75 fish, how many more will she need to build?
Answer:
With the tanks already built it has room for 3 tanks * 15 fish / tank = 45 fish. The total of fish that still lack space is 75 fish - 45 fish = 30 fish. This means Jennifer needs 30 fish / 10 fish / tank = 3 tanks of 10 fish. The answer is 3.