Reasoning and answer: For all his activities on the train, Bret spends 2 + 1 + 3 = 6 hours. For his nap, he has 9 - 6 = 3 hours left.
The answer: 3
What was the question?
Question: Bret takes a 9 hour train ride to go to Boston.  He spends 2 hours reading a book, 1 hour to eat his dinner, and 3 hours watching movies on his computer. How many hours does he have left to take a nap?


Two pairs of shoes at $50 a pair costs $50 x 2 = $100. The shoes are discounted by 40 percent so she only pays 100 - 40 = 60 percent of the original price. Therefore the two pairs of shoes cost $100 x 0.60 = $60. The dress is discounted by 20 percent so she only pays 100 - 20 = 80 percent of the original price. Therefore the dress costs $100 x 0.80 = $80. In total Daniela spends $60 + $80 = $140 for two pairs of shoes and a dress.
The answer: 140
Reverse engineering the question: Daniela goes shopping during a sale. She finds out that the store has 40 percent off on shoes and 20 percent off dresses. If Daniela buys 2 pairs of shoes originally priced at $50 a pair and a dress originally priced at $100, how much money does she spend?


Reasoning and answer: Running the length of a football field 2000 meters in 2 hours is a speed of 2000 / 2 = 1000 meters per hour. At the same speed, Amanda will run the length of a 10000 - meter track in 10000 / 1000 = 10 hours.
The answer: 10
What was the question?
Question: If Amanda can run the length of a football field 2000 meters in length in 2 hours, how long would it take her to run the length of a 10000-meter track at the same speed?


Before his maize is stolen, the maize he stores at the end of 1 year is 12 * 1 = 12 tonnes of maize. Before his maize is stolen, the maize he stores at the end of 2 years is 12 * 2 = 24 tonnes of maize. After his maize is stolen, he is left with 24 - 5 = 19 tonnes of maize. After he receives the maize donation, he has 19 + 8 = 27 tonnes of maize.
The answer: 27
Reverse engineering the question: Alfred is storing a tonne of maize each month for the next 2 years. If 5 tonnes are stolen and 8 tonnes are given to him as a donation, how many tonnes of maize does he have at the end of the 2 years.


Reasoning and answer: The cost of the planks for one birdhouse is 7 * 3 = $21. And the nails are a cost of 20 * 0.05 = $1 for each birdhouse. So to build one birdhouse one will need 21 + 1 = $22. So the cost of building 4 birdhouses is at 4 * 22 = $88.
The answer: 88
What was the question?
Question: Building one birdhouse requires 7 planks and 20 nails. If 1 nail costs $0.05, and one plank costs $3, what is the cost, in dollars, to build 4 birdhouses?


Reasoning and answer: 8 boys + 8 girls = 16 students joined the field trip. Thus, 18 - 16 = 2 girls were not able to join the field trip.
The answer: 2
What was the question?
Question:
There were 18 students assigned in a minibus for a field trip. Eight of these students were boys. On the day of the field trip, the number of girls and boys was the same since some of the girls were not able to join the trip. How many girls were not able to join the field trip?