Reasoning and answer: There are a total of 8 + 4 + 2 + 1 = 15 games of tennis in a typical tournament. If 1 game uses 5 cans of tennis balls, then 15 games would use 15 * 5 = 75 cans of tennis balls. If 1 can of tennis balls has 3 balls, then 75 cans would have 225 balls.
The answer: 225
What was the question?
Question: A typical tournament of tennis has 4 rounds. There are 8 games in the first round, 4 in the second round, 2 in the third round and 1 during the finals. If each game requires new tennis balls, and on average each game uses 5 cans of tennis balls, how many tennis balls in total are used at the end of the tournament if each can has 3 tennis balls?


60 packs of cards * 7 cards per pack = 420 cards. 420 cards / 10 cards per page = 42 pages.
The answer: 42
Reverse engineering the question: Punger collects baseball cards. He buys 60 packs of baseball cards. Each pack has 7 cards inside. He wants to put these cards in special pages to protect the cards. Each page can hold 10 cards. How many pages does he need to buy?


Reasoning and answer: After one year he earns $200 in interest because 1,000 x .2 = 200. After one year it has $1,200 in the account because 1,000 + 200 = 1,200. He takes out $600 because 1,200 / 2 = 600. After this it has $600 in it because 1,200 - 600 = 600. She earns $90 in interest because 600 x .15 = 90. The account now has $690 because 600 + 90 = 690.
The answer: 690
What was the question?
Question: Tony puts $1,000 in a savings account for 1 year. It earns 20% interest. He then takes out half the money to buy a new TV. The next year, the remaining money earns 15% interest. How much is now in the account?


Jerry has to walk to the sink / recycling bin 28 cans / 4 cans per trip = 7 trips. The round trip takes 10 seconds per way * 2 ways = 20 seconds. Counting the time he spent pouring out the cans and the time the round trip took, he spent 20 seconds per trip + 30 seconds per trip = 50 seconds per trip. With 7 round trips, he spent 50 seconds per trip * 7 trips = 350 seconds.
The answer: 350
Reverse engineering the question: Jerry has a bunch of half-empty soda cans on his desk. He needs to drain all of them and put them in the recycling bin. He can carry four cans at once, and it takes him 30 seconds to drain those 4 cans. It takes him ten seconds each way to walk to the sink and recycling bin and then back to his desk. If there are 28 cans on Jerry's desk, how long does it take him to throw all of them away?


Reasoning and answer: Tina ate one twice a day for 5 days so 2 * 5 = 10. Her husband at 1 per day for 5 days so 1 * 5 = 5. She made 24, ate 10, her husband ate 5 and the guests ate 4 so 24 - 10 - 5 - 4 = 5 brownies left.
The answer: 5
What was the question?
Question: Tina made a large pan of brownies and cut it into 24 pieces. She had one with lunch and dinner every day for 5 days. Her husband snagged one per day for 5 days to take to work. They shared 4 with dinner guests. How many brownies were left?


Reasoning and answer: He saved money for 2 years, which is equal to 12 x 2 = 24 months. The amount of money he saved is $25 * 24 = $600. But he spent some money so there is $600 - $400 = 200 left.
The answer: 200
What was the question?
Question:
John puts $25 in his piggy bank every month for 2 years to save up for a vacation. He had to spend $400 from his piggy bank savings last week to repair his car. How many dollars are left in his piggy bank?