He can type out 1 page in 450 / 90 = 5 minutes. So it would take 5 * 10 = 50 minutes.
The answer: 50
Reverse engineering the question: Tom can type 90 words a minute. A page is 450 words. How long would it take him to type out 10 pages?


Reasoning and answer: This month, Lily wants to finish reading 4 x 2 = 8 books. So, for two months, she will finish reading 4 + 8 = 12 books.
The answer: 12
What was the question?
Question: For this month, Lily wants to finish reading twice as many books as she finished last month. If she finished reading 4 books last month, what will be the total number of books that she will finish for two months?


The chocolate doughnuts cost 10 * $2 = $20. The glazed doughnuts cost 15 * $1 = $15. The total cost for the doughnuts is $20 + $15 = $35.
The answer: 35
Reverse engineering the question: Bryce is bringing in doughnuts for his class. There are 25 students in his class, 10 kids want chocolate doughnuts and 15 want glazed doughnuts. The chocolate doughnuts cost $2 each and the glazed doughnuts cost $1 each. How much is the total cost for doughnuts?


Reasoning and answer: From selling his shirts, Kekai makes 5 * $1 = $5. From selling his pants, Kekai makes 5 * $3 = $15. The total amount of money Kekai earns is $5 + $15 = $20. Since Kekai gives half of the money to his parents, he has $20 / 2 = $10 left.
The answer: 10
What was the question?
Question: Kekai's family is having a garage sale. Kekai sells 5 shirts and 5 pairs of pants. Each shirt sells for $1, and each pair of pants sells for $3. If Kekai gives his parents half of the money he earns from selling his clothes, how much money does Kekai have left?


She sleeps 7 * 5 = 35 hours on weekdays. She sleeps 8 * 2 = 16 hours on weekends. 35 + 16 = 51 hours is the amount of time she sleeps in a week.
The answer: 51
Reverse engineering the question: Janna sleeps 7 hours each day during weekdays and 8 hours each day during weekends. How many hours does she sleep in a week?


60% of female alligators are adults because 100 - 40 = 60. There are 25 female alligators because 15 / .6 = 25. There are 50 alligators in total because 25 / .5 = 50. There are 25 male alligators because 50 / 2 = 25.
The answer: 25
Reverse engineering the question:
Lagoon island is populated by alligators. Half the alligators are male. The rest are female. Among the females, 40% are juveniles. There are 15 adult females. How many male alligators are there?