Two pairs of sunglasses costs 2 x $50 = $100. So, Mary spent $100 + $100 = $200. Thus, two decks of basketball cards costs $200 - $150 = $50. Therefore, one deck of basketball cards costs $50 / 2 = $25.
The answer: 25
Reverse engineering the question: Mary and Rose went shopping to buy presents. They spent the same amount. Mary bought two pairs of sunglasses for $50 each and a pair of jeans for $100. Rose bought a pair of shoes at $150 and two decks of basketball cards. How much did one deck of basketball cards cost?


Reasoning and answer: Each of Pam's bags contain 40 * 3 = 120 apples. Pam has 120 * 10 = 1200 apples.
The answer: 1200
What was the question?
Question: Pam has 10 bags of apples. Each of her bags has as many apples as 3 of Gerald's bags. If Gerald's bags have 40 apples each, how many apples does Pam have?


The pool currently has 48 + 32 = 80 tiles. The pool needs 100 - 80 = 20 more tiles to be completed.
The answer: 20
Reverse engineering the question: A pool has 48 blue tiles and 32 red tiles. If the pool needs 100 tiles to be completed, how many more tiles are needed?


Reasoning and answer: On Monday, there were 50 visitors. On Tuesday, there were twice as many, so 2 * 50 = 100 visitors. The total number of visitors after Tuesday will be 100 + 50 = 150 visitors. For the remaining 5 days, an average of 20 visitors attended, giving a total of 5 * 20 = 100 visitors. The total number of visitors who visited the library for the week was 100 + 150 = 250 visitors.
The answer: 250
What was the question?
Question: Jenny's local library received 50 visitors on Monday. On Tuesday, the library received twice that number. On the remaining days of the week, an average of 20 visitors went to the library. What's the total number of visitors who went to the library that week?


First find the number of votes for the unicorn cake: 7 votes * 3 = 21 votes. Then find the number of votes for the dragon cake: 25 votes + 7 votes = 32 votes. Then add the number of votes for each cake to find the total number of votes: 21 votes + 32 votes + 7 votes = 60 votes.
The answer: 60
Reverse engineering the question: In the baking contest, three times as many people voted for the unicorn cake compared to the witch cake, and the number of votes for the dragon cake was 25 more than the number of votes for the witch cake. If 7 people voted for the witch cake, how many votes were cast total?


Weng earns 12 / 60 = $0.2 per minute. Working 50 minutes, she earned 0.2 x 50 = $10.
The answer: 10
Reverse engineering the question:
Weng earns $12 an hour for babysitting. Yesterday, she just did 50 minutes of babysitting. How much did she earn?