There are 7 * 2 = 14 days in two weeks. So he played 14 * 4 = 56 hours. That means the total length of the game is 56 / .4 = 140 hours. So he has 140 - 56 = 84 hours to beat the game. So it will take him 84 / 7 = 12 days to beat the game.
The answer: 12
Reverse engineering the question: John plays a game for 4 hours a day every day for 2 weeks. After all that time, he is only 40% done. He increased his playtime to 7 hours a day. How long until he finishes the game?


Reasoning and answer: With the price of each doll at $4, this means he has saved a total of 15 * 4 = $60. When the price is lowered to $3 each, he can now purchase 60 / 3 = 20 dolls.
The answer: 20
What was the question?
Question: Daniel collects Russian dolls that normally cost $4 each. He saves enough money to buy 15 Russian dolls. However, the price suddenly drops to $3 each. How many Russian dolls can he buy now at the discounted price, given his savings?


Maggie sells 2 subscriptions to a neighbor and twice that amount to another neighbor so she sells 2 * 2 = 4 subscriptions to the other neighbor. In total, Maggie sells 4 + 1 + 2 + 4 = 11 subscriptions. She earns $5.00 per subscription she sells so she earns 5 * 11 = $55.00.
The answer: 55
Reverse engineering the question: Maggie has an after-school job that pays her $5.00 for every magazine subscription she can sell. She sells 4 to her parents, 1 to her grandfather, 2 to the next-door neighbor and twice that amount to another neighbor. How much money did Maggie earn?


Reasoning and answer: Sarah's name has 5 letters, so the first number to add is 5. The second number is twice Sarah's age, so it is 2 * 9 = 18. Adding the numbers together, the game predicts that Sarah will get married at 5 + 18 = 23 years old.
The answer: 23
What was the question?
Question: Diane shows Sarah a game that deciphers at what age she will marry based on her name and current age. Sarah is 9 years old. The game consists of adding the number of letters in the player's name plus twice the player's age. According to the game, at what age will Sarah get married?


On Monday Kendra saw 5 sites x 7 birds / site = 35 different birds. On Tuesday Kendra saw 5 sites x 5 birds / site = 25 different birds. On Wednesday Kendra saw 10 sites x 8 birds / site = 80 different birds. In total Kendra saw 35 birds + 25 birds + 80 birds = 140 different birds. In total Kendra visited 5 sites + 5 sites + 10 sites = 20 sites. On average Kendra saw 140 birds / 20 sites = 7 different birds at each site.
The answer: 7
Reverse engineering the question: Kendra tracks the different species of birds they spot on their birdwatching trip. On Monday they visited 5 sites and saw an average of 7 birds at each site. On Tuesday, Kendra visited 5 sites and saw an average of 5 birds at each site. On Wednesday visited 10 sites and saw an average of 8 birds at each site. On average, how many different birds did Kendra see on each site?


He had to pay for 20 * .6 = 12 car washes. That means he had to pay 12 * 15 = $180.
The answer: 180
Reverse engineering the question:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
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Jim buys a package of 20 car washes. Since He bought a package he only has to pay 60%. A carwash normally costs 15 dollars. How much did he pay for the package?