Maria has 8 + 10 = 18 black pens. Maria has 8 + 7 = 15 blue pens. Maria has 8 + 18 + 15 = 41 pens in total.
The answer: 41
Reverse engineering the question: There are 8 red pens in Maria's desk drawer. There are 10 more black pens than red pens. There are also 7 more blue pens than red pens. How many pens are there in all?
Reasoning and answer: 12 * 12 = 144 square meters. 8 * 5 = 40 square meters. 144 - 40 = 104 square meters. 104 square meters of the playground are not covered by the maintenance building.
The answer: 104
What was the question?
Question: There is a square playground that has a side length of 12 meters. There is a maintenance building on the playground that measures 8 meters by 5 meters. How many square meters of the playground is not covered by the maintenance building?
First find the total amount of fertilizer the horses produce per day: 5 gallons / horse * 80 horses = 400 gallons. Then multiply the number of acres of farmland by the number of gallons per acre to find the total amount of fertilizer needed: 400 gallons / acre * 20 acres = 8000 gallons. Then divide the total amount of fertilizer needed by the amount of fertilizer produced per day to find the number of days needed to collect fertilizer: 8000 gallons / 400 gallons / day = 20 days. Then divide the total number of acres Janet needs to cover by the number of acres she can cover per day to find how many days it takes her to cover them all: 20 acres / 4 acres / day = 5 days. Then add the time to collect the fertilizer to the time to spread it to find the total time: 5 days + 20 days = 25 days.
The answer: 25
Reverse engineering the question: Janet uses her horses' manure as fertilizer. One horse produces 5 gallons of fertilizer per day. Once Janet has collected enough fertilizer, she'll spread it over 20 acres of farmland. Each acre needs 400 gallons of fertilizer and Janet can spread fertilizer over 4 acres per day. If Janet has 80 horses, how long will it take until all her fields are fertilized?
Reasoning and answer: Terry's weekly income is $24 x 7 = $168. Jordan's weekly income is $30 x 7 = $210. So, the difference between their weekly income is $210 - $168 = $42.
The answer: 42
What was the question?
Question: Terry's daily income is $24, while Jordan's daily income is $30. Working 7 days a week, how much is the difference between their weekly incomes?
Each 5 by 5 painting is 25 square feet because 5 x 5 = 25. All three of them take up 75 square feet because 3 x 25 = 75. The 10 by 8 painting takes up 80 square feet because 10 x 8 = 80. These four paintings take up 155 square feet because 80 + 75 = 155. The final painting is 45 square feet because 200 - 155 = 45. If it is 5 feet wide it is 9 feet tall because 45 / 5 = 9.
The answer: 9
Reverse engineering the question: Yanni has 5 paintings that combined, take up 200 square feet. 3 of the paintings are 5 feet by 5 feet. 1 painting is 10 feet by 8 feet. If the final painting is 5 feet tall, how wide is it?
If the class has 300 students, there are 40 / 100 * 300 = 120 smoking students. In a year, 70% of the smoking students are hospitalized from smoking - related complications, a total of 70 / 100 * 120 = 84 students. The number of smoking students who've not been hospitalized from smoking - related complications is 120 - 84 = 36.
The answer: 36
Reverse engineering the question:
In a class of 300 students, the number of smoking teens is 40% of the class. In a year, 70% of the smoking students are hospitalized from smoking-related complications. Calculate the total number of smoking students from the class who have not been hospitalized from smoking-related complications.