Reasoning and answer: Knowing that dogs live 4 times the age of hamsters, dogs live 4 * 2.5 = 10 years. If Ruth takes care of the fish, it can live 10 + 2 = 12 years.
The answer: 12
What was the question?
Question: To let Ruth know how long her fish will live, her father tells her that well-cared fish can live 2 years longer than dogs live. On average, dogs live 4 times as long as hamsters live. And hamsters live an average of 2.5 years. How long can a fish live?


Each screen shows movies all day, which means each screen shows 8 hours / day / 2 hours per movie = 4 movies / day. So in total, the movie theater shows 6 screens * 4 movies / day = 24 movies.
The answer: 24
Reverse engineering the question: A movie theater has 6 screens which show movies back-to-back all day. If the movie theater is open for 8 hours, and each movie lasts 2 hours, how many movies are shown in total throughout the day?


Reasoning and answer: There are a total of 5 vans x 28 students = 140 students. If 60 are boys, then 140 - 60 = 80 of these students are girls.
The answer: 80
What was the question?
Question: Five coaster vans are used to transport students for their field trip. Each van carries 28 students, 60 of which are boys. How many are girls?


If Bom has 300 seeds, then Gwi has 300 + 40 = 340 watermelon seeds. Together, Bom and Gwi have 340 + 300 = 640 melon seeds. Yeon's number of watermelon seeds is three times as many as the number that Gwi has, meaning Yeon has 3 * 340 = 1020 watermelon seeds. Together, the three friends have 1020 + 640 = 1660 watermelon seeds.
The answer: 1660
Reverse engineering the question: Yeon has three times as many watermelon seeds as Gwi. Gwi has 40 more watermelon seeds than Bom. If Bom has 300 watermelon seeds, how many seeds do they have together?


Reasoning and answer: Natalia sold 48 / 2 = 24 clips in May. Natalia sold 48 + 24 = 72 clips altogether in April and May.
The answer: 72
What was the question?
Question: Natalia sold clips to 48 of her friends in April, and then she sold half as many clips in May. How many clips did Natalia sell altogether in April and May?


Reasoning and answer: In the beginning, Betty has only 100 / 2 = $50. Betty's grandparents gave her 15 * 2 = $30. This means, Betty needs 100 - 50 - 30 - 15 = $5 more.
The answer: 5
What was the question?
Question:
Betty is saving money for a new wallet which costs $100. Betty has only half of the money she needs. Her parents decided to give her $15 for that purpose, and her grandparents twice as much as her parents. How much more money does Betty need to buy the wallet?