Reasoning and answer: He got a discount of 1200 * .15 = $180. So he paid 1200 - 180 = $1020.
The answer: 1020
What was the question?
Question: Tim buys a cabinet for $1200 and gets a 15% discount. How much did he pay?


His first mile was in 6 minutes, then 5 minutes, another 5 minutes and his final mile was 4 minutes so it took him 6 + 5 + 5 + 4 = 20 minutes. It took 20 minutes to run 4 miles so his average time was 20 / 4 = 5 minutes per mile.
The answer: 5
Reverse engineering the question: Colin ran his first mile in 6 minutes. He ran his next two miles in 5 minutes each and finished his 4th mile in 4 minutes. What was the average time it took him to run a mile?


Reasoning and answer: John is 8 years old because 18 - 10 = 8 years old. Their parents are currently 40 years old because 8 * 5 = 40. Therefore, they were 22 when Mark was born because 40 - 18 = 22 years old.
The answer: 22
What was the question?
Question: Mark is 18 years old. He has a little brother, John, who is 10 years younger. If John and Mark's parents are currently 5 times older than John, how old were they when Mark was born?


The total runtime for the first three machines is 3 machines * 23 hours / day / machine = 69 hours / day. So these machines could produce 69 hours / day * 2 kg / hour = 138 kg / day. The fourth machine could produce 12 hours / day * 2 kg / hour = 24 kg / day of material. In total all the machines would produce 138 kg / day + 24 kg / day = 162 kg / day of material. The factory would therefore earn 162 kg / day * $50 / kg = $8100 / day.
The answer: 8100
Reverse engineering the question: In a factory, there are 3 machines working 23 hours a day. The owner decided to buy a fourth machine, which works only 12 hours a day. One machine can produce 2 kg of material every hour. The factory sells the produced material for $50 per 1 kg. How much can this factory earn in one day?


Reasoning and answer: She needs to run 70 laps in total each week, because 3500 divided by 50 equals 70. Since there are seven days in a week, she needs to run 10 laps per day because 70 divided by 7 equals 10.
The answer: 10
What was the question?
Question: Tammy wants to run 3500 meters per week. She knows her track at school is 50 meters around. If she wants to run the same amount each day, how many loops should she make per day?


Reasoning and answer: Jack's mother asked him to buy 2 * 4 = 8 bottles of water. Thus Jack bought 4 + 8 = 12 bottles of water in total. Altogether, the bottles of water cost 12 * $2 = $24. The cheese cost 1 / 2 * $10 = $5. So Jack spent $24 + $5 = $29 on water and cheese. Since he started with $100, he now has $100 - $29 = $71 left.
The answer: 71
What was the question?
Question:
Jack went to a supermarket with $100 and bought 4 bottles of water. Then his mother called him and asked him to buy twice as many bottles as he already bought. Each bottle cost $2. Finally, he also bought half a pound of cheese and 1 pound of cheese costs $10. How much money does Jack have remaining?