Kayla bought 12 chocolate bars / 2 = 6 chocolate bars. She also bought 18 soda cans / 2 = 9 soda cans. The total number of chocolate bars and soda cans Kayla bought is 6 chocolate bars + 9 soda cans = 15 items.
The answer: 15
Reverse engineering the question: Kayla and Theresa went to buy some chocolate bars and soda cans. Theresa bought twice the number of chocolate bars and soda cans Kayla bought. If Theresa bought 12 chocolate bars and 18 soda cans, how many chocolate bars and soda cans did Kayla buy in total?


Reasoning and answer: This past Saturday, Jessy and Alan told a total of 11 + 7 = 18 jokes together. Since Jessy told eleven jokes this past Saturday, when he doubles the number of jokes next Saturday, the number of jokes will be 2 * 11 = 22 next Saturday. At the same time, after telling seven jokes this Saturday, when he doubles the number of jokes next Saturday, Alan will tell 2 * 7 = 14 jokes. Next Saturday, they will tell 14 + 22 = 36 jokes together. In total, the number of jokes will be 36 + 18 = 54 jokes on the two Saturdays.
The answer: 54
What was the question?
Question: Jessy told eleven jokes this past Saturday, and Alan told seven jokes. If they doubled the number of jokes they told this past Saturday next Saturday, how many jokes would they have told in total together so far?


Avery has a total of 20 * 6 = 120 eggs. Avery can fill up 120 / 12 = 10 egg cartons.
The answer: 10
Reverse engineering the question: Avery has 20 chickens on his farm. Each chicken lays 6 eggs. He wants to fill up egg cartons with eggs. If each egg carton can hold a dozen (12 eggs), how many egg cartons can Avery fill?


Reasoning and answer: Lindsay has 4 x 4 = 16 brown - haired dolls. She has 16 - 2 = 14 black - haired dolls. Thus, Lindsay has 16 + 14 = 30 black and brown hair dolls combined. Therefore, she has 30 - 4 = 26 more dolls with black and brown hair combined than blonde - haired dolls.
The answer: 26
What was the question?
Question: Lindsay has 4 dolls with blonde hair; four times more dolls with brown than blonde hair; 2 fewer dolls with black than brown hair. How many more dolls with black and brown hair combined does Lindsay have than blonde-haired dolls?


Every week Carl needs to drive additional 6 hours, so in two weeks that would make 2 * 6 = 12 additional hours. Two weeks of driving 2 hours every day, means 14 * 2 = 28 hours of driving. So during two weeks, Carl will drive 28 + 12 = 40 hours.
The answer: 40
Reverse engineering the question: To make a living, Carl needs to drive a car for 2 hours every day. After he got promoted he needs to drive for 6 more hours every week. How many hours will Carl drive in two weeks?


In the second month, Vinny lost half as much as he had the first month, so he lost 20 pounds / 2 = 10 pounds. In the third month, he again lost half as much which was 10 pounds / 2 = 5 pounds. And in the fourth month, he lost 5 pounds / 2 = 2.5 pounds. So in total, Vinny lost 20 + 10 + 5 + 2.5 = 37.5 pounds in the first four months. Over his entire diet, he had lost 300 – 250.5 = 49.5 pounds. So in the fifth month, Vinny must have lost 49.5 pounds total loss – 37.5 pounds loss in the first four months = 12 pounds.
The answer: 12
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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Vinny weighed 300 pounds then lost 20 pounds in the first month of his diet. He continued his diet but each month, he lost half as much weight as he had lost in the previous month. At the start of the fifth month of his diet, he worked harder to lose extra weight then decided to end his diet. If Vinny weighed 250.5 pounds at the end of his diet, how many pounds did he lose throughout the fifth month?