It will take 3 * 5 = 15 minutes to brush his cats. All together, it will take 45 + 60 + 30 + 15 = 150 minutes to clean his apartment. In three hours, there are 60 * 3 = 180 minutes. Thus, he will have 180 - 150 = 30 minutes of free time remaining.
The answer: 30
Reverse engineering the question: Gunther needs to clean his apartment. It takes him 45 minutes to vacuum the carpets, 60 minutes to dust the furniture, 30 minutes to mop the floors in his kitchen, and 5 minutes to brush each cat, and he has three cats. If he has 3 hours of free time available, and he uses this time to clean his apartment, how many minutes of free time will he have left after he cleans the apartment?

Since there are 100 units, the number of units occupied by tenants is 3 / 4 * 100 = 75. If each tenant pays $400 every month, Mr Maximilian receives 75 * $400 = $30000 in rent revenue every month. In a year, Mr Maximilian receives $30000 * 12 = $360000 in rent revenue.
The answer: 360000
Reverse engineering the question: Mr. Maximilian has a rental building that he collects rent from every month. The number of units in the building is 100. If the building is 3/4 occupied for a whole year, and each resident of the building pays a rent of $400, calculate the amount of money Mr. Maximilian receives in that year.

John runs 100 - 4 = 96 meters once he reaches his max speed. He runs it in 13 - 1 = 12 seconds. So he runs at a speed of 96 / 12 = 8 m / s. So that means James's top speed is 8 + 2 = 10 m / s. He has to run 100 - 10 = 90 meters at his top speed. So he runs that at 90 / 10 = 9 seconds. So he takes 9 + 2 = 11 seconds to run 100 meters.
The answer: 11
Reverse engineering the question: It takes John 13 seconds to run 100 meters. He only goes 4 meters in the first second. He then maintains the same speed for the rest of the race. James is 2 m/s faster at the top speed and he can run the first 10 meters in 2 seconds. How long does it take James to run 100 meters?

There are 4 tables, 1 sofa and 2 chairs that have 4 legs each so 4 + 1 + 2 = 7 pieces of furniture. These 7 pieces have 4 legs each so they have 7 * 4 = 28 legs. There are 3 tables with 3 legs each so they have 3 * 3 = 9 legs. We have 28 legs and 9 legs as well a 1 leg on a table and 2 on a rocking chair for a total of 28 + 9 + 1 + 2 = 40 legs.
The answer: 40
Reverse engineering the question:
There is a very large room that has 4 tables, 1 sofa and 2 chairs that have 4 legs each. There are also 3 tables with 3 legs each, 1 table with 1 leg, and 1 rocking chair with 2 legs. How many legs are there in the room?