Reasoning and answer: Cindy gave her four friends 80 marbles each, a total of 4 * 80 = 320 marbles. She was left with 500 - 320 = 180 marbles. Four times the number of marbles she has remaining is 180 * 4 = 720.
The answer: 720
What was the question?
Question: Out of the 500 marbles that Cindy had, she gave her four friends 80 marbles each. What's four times the number of marbles she has remaining?


We know that the time that Anna spends traveling is 20 minutes less than Jenny's travel time: a = j - 20. We also know that the distance both people travel is equal, so their speeds times their travel times must be equal: 15j = 45a. Substituting the first equation into the second equation, we get 15j = 45(j - 20). Multiplying through the parentheses we get 15 j = 45j - 900. Subtracting 45 j from both sides, we get - 30j =  - 900. Dividing both sides by - 30, we get j = 30. Since Anna travels 20 minutes less than Jenny, she traveled 30 minutes - 20 minutes = 10 minutes.
The answer: 10
Reverse engineering the question: Jenny leaves her house at 8:00 with some cupcakes for her daughter's birthday party at school. She jogs to the school at 15 miles per hour. Half an hour later, her wife Anna realizes that Jenny used peanut butter frosting because she forgot one of the kids in the class had a severe peanut allergy. Jenny doesn't have her cell phone, so Anna leaves the house driving at 45 miles her hour to catch Jenny and warn her. How long does Anna spend traveling in minutes?


Reasoning and answer: The money she earns from selling paintings is 3 * $50 = $150. The total money she makes from her art is $150 + $150 = $300.
The answer: 300
What was the question?
Question: Hallie is an artist. She wins an art contest, and she receives a $150 prize. She sells 3 of her paintings for $50 each. How much money does she make in total from her art?


He filled 3 boxes with 15 books each so 3 * 15 = 45 books. From the rest of his house he is donating 45 + 21 + 4 + 18 = 88 books for donation. His collection is 99 books and he is donating 88 books, so that leaves him with 99 - 88 = 11 books. He picks up 12 books to add to his collection of 11 books so he now has 12 + 11 = 23 books.
The answer: 23
Reverse engineering the question: Henry needs to declutter his book collection of 99 books. From his bookshelf, he was able to fill 3 boxes of 15 books each to take to a donation center. He had 21 books in a room he could donate, 4 on his coffee table and 18 cookbooks stashed in the kitchen. When he dropped them off, he noticed a box of books that had a "free to a good home" note. He grabbed 12 books to take back to his place. How many books does Henry now have?


Reasoning and answer: He bought 5 * 12 = 60 sodas. So he had 60 + 10 = 70 sodas. So he drank 70 / 7 = 10 sodas per day.
The answer: 10
What was the question?
Question: James buys 5 packs of sodas that are 12 sodas each. He had 10 sodas already. He finishes all the sodas in 1 week. How many sodas does he drink a day?


Reasoning and answer: The combined length of all the rope is 41 feet because 8 + 20 + (2 x 3) + 7 = 41. He loses 6 feet from the knots because 5 x 1.2 = 6. The final length is 35 feet because 41 - 6 = 35.
The answer: 35
What was the question?
Question:
Tony wants to build the longest rope he possibly can, so he collects all the rope in his home. He finds an 8-foot rope, a 20-foot rope, three 2 foot ropes, and a 7-foot rope. each knot between the ropes makes him lose 1.2 foot per knot. How long is his rope when he's done tying them all together?