Krystiana earns $15 x 3 = $45 for the rooms on the first floor every month. She earns $20 x 3 = $60 for the rooms on the second floor every month. And the cost for each room on the third floor is $15 x 2 = $30. So, the total amount she earns for the rooms on the third floor is $30 x 2 = $60 every month. Therefore, the total amount she earns from the apartment building is $60 + $60 + $45 = $165.
The answer: 165
Reverse engineering the question: Krystiana owns an apartment building. The rooms on the first floor cost $15 per month and the rooms on the 2nd floor cost $20 per month. The rooms on the third floor cost twice as much as the rooms on the first floor, but only two rooms are occupied. If each floor has 3 rooms, how much does Krystiana earn every month?


Reasoning and answer: Every day, the sprinkler uses 4 + 6 = 10 liters of water. Hence, it takes the sprinkler system 50 / 10 = 5 days to use 50 liters of water.
The answer: 5
What was the question?
Question: A desert garden’s sprinkler system runs twice a day during the cool morning and evening hours. It waters the garden with four liters of water in the morning and six liters in the evening. How many days does it take the sprinkler system to use 50 liters of water?


The class was divided into 3 + 2 = 5 parts. So each part is equal to 100 / 5 = 20 students. Since there are 3 parts for boys, then there are 20 x 3 = 60 boys in class. So there are 100 - 60 = 40 girls in class. Hence, there are 60 - 40 = 20 boys more than girls.
The answer: 20
Reverse engineering the question: There are 100 students in class and the ratio of boys to girls is 3:2. How many more boys than girls are there?


Reasoning and answer: Cristian eats 3 / 4 * 80 = 60 white cookies from the jar, 3 / 4 of the total number of white cookies in the cookie jar. The number of white cookies remaining in the cookie jar is 80 - 60 = 20. In his cookie jar, Cristian also has 80 + 50 = 130 black cookies. He eats 1 / 2 * 130 = 65 black cookies from the cookie jar. He remains with 130 - 65 = 65 black cookies after eating half of them. In total, Cristian has 65 + 20 = 85 cookies remaining in the jar.
The answer: 85
What was the question?
Question: Cristian has 50 more black cookies in his cookie jar than white cookies. He eats half of the black cookies and 3/4 of the white cookies. If he initially had 80 white cookies, how many cookies are remaining within the cookie jar altogether?


Mark is (5 * 12) + 3 = 63 inches tall. Mike is (6 * 12) + 1 = 73 inches tall. Hence, Mike is 73 - 63 = 10 inches taller.
The answer: 10
Reverse engineering the question: Mark is 5 feet 3 inches tall and Mike is 6 feet and 1 inch tall. How much taller is Mike than Mark in inches if 1 foot is equal to 12 inches?


There are 4 weeks in a month so Cathy and Chris were supposed to work for 4 weeks / month x 2 months = 8 weeks each. Since Chris got sick then Chris was only able to work for 8 weeks - 1 week = 7 weeks while Cathy worked for 8 weeks + 1 week = 9 weeks. Therefore, Cathy worked for 9 weeks x 20 hours / week = 180 hours.
The answer: 180
Reverse engineering the question:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
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Cathy and Chris got summer jobs at the cake shop and were supposed to work 20 hours per week each for 2 months. During that time, Chris got sick for one week and Cathy took her shifts. If there are four weeks in a month, how many hours did Cathy work during the 2 months?