Reasoning and answer: If Doug, Betty's friend, is 40 years old, and the sum of their ages is 90, Betty is 90 - 40 = 50 years old. Since twice Betty's age is the cost of a pack of nuts, a pack of nuts is sold at 2 * $50 = $100. If Betty wants to buy 20 packs of the nuts, she'll have to pay 20 * $100 = $2000.
The answer: 2000
What was the question?
Question: Twice Betty's age is the cost of a pack of nuts. Doug, Betty's friend, is 40 years old. If the sum of their ages is 90, and Betty wants to buy 20 packs of the nuts, calculate the amount of money she'll pay for the packs of nuts.


Each trip, they add Caleb’s 7 gallons + Cynthia’s 8 gallons = 15 gallons. Since they are adding 15 gallons every trip, to fill the 105 - gallon pool, it would take 105 / 15 = 7 trips.
The answer: 7
Reverse engineering the question: Caleb and Cynthia are filling up their inflatable pool with water using buckets. They fill their buckets at the spigot and carry them to the pool. Caleb can add 7 gallons from his bucket and Cynthia can add 8 gallons from her bucket each trip. It will take 105 gallons to fill the pool. How many trips will it take for Caleb and Cynthia to fill the pool with their buckets?


Reasoning and answer: Gargamel saved $36 for all four tires, so to find the savings per tire was $36 / 4 = $9 saved per tire. Adding the savings to the discount price, the original price was $75 + $9 = $84.
The answer: 84
What was the question?
Question: Gargamel needed new tires for his truck. He went to the auto shop and bought 4 tires on sale for $75 each. The salesman told him that he saved a total of $36. If Gargamel saved the same amount on each tire, what was the original price of each tire?


Arthur spent 4 / 5 * $200 = $160. Thus he has $200 - $160 = $40 remaining.
The answer: 40
Reverse engineering the question: Arthur has $200 in his wallet. He spends four-fifths of that. How much does he have left?


Reasoning and answer: The drive has 1.5 * 2000 = 3000 kilobytes of storage space. It already has 1.5 * 400 = 600 kilobytes of storage space taken up. Thus, it has 3000 - 600 = 2400 kilobytes of space left. The portable drive can store 2400 / 200 = 12 200 - kilobyte videos on it with 400 photos.
The answer: 12
What was the question?
Question: A portable computer drive has enough kilobytes of storage space to store 2000 photos. Each photo is 1.5 kilobytes in size. How many 200-kilobyte videos can it store if it already has 400 photos on it?


Reasoning and answer: Jack earned from the brownies $3 per brownie * 4 brownies = $12. Jack earned from the lemon squares $2 per square * 5 squares = $10. He still needs to earn $50 - $12 - $10 = $28. He sells cookies for $4 each, so Jack still needs to sell $28 / $4 = 7 cookies.
The answer: 7
What was the question?
Question:
Jack is running a bake sale to help pay for his basketball team's uniforms. He's already sold 4 brownies for $3 each and 5 lemon squares for $2 each. If Jack's goal is to make $50 and he sells cookies for $4 each, how many cookies does he need to sell to reach his goal?