His original investment was 15 * 20 = $300. The value of his investment increases by 15 * 2 / 3 = $10 per coin. So each coin was worth 15 + 10 = $25. So he sold 300 / 25 = 12 coins.
The answer: 12
Reverse engineering the question: James buys 20 coins of a cryptocurrency at $15 each. The value of the coins increases by 2/3. He sells coins to recoup his original investment. How many coins did he sell?


Reasoning and answer: There are 19 cars at the lot, so there are 5 * 19 = 95 wheels of cars. So there are 117 - 95 = 22 wheels of motorcycles in the parking lot. Each motorcycle has 2 wheels, so that leaves us with 22 / 2 = 11 motorcycles in the parking lot.
The answer: 11
What was the question?
Question: In a parking lot, there are cars and motorcycles. Each car has 5 wheels (including one spare) and each motorcycle has 2 wheels. There are 19 cars in the parking lot. Altogether all vehicles have 117 wheels. How many motorcycles are at the parking lot?


Jorge has 60 * (1 / 3) = 20 acres of clay - rich soil. He has 60 - 20 = 40 acres of good soil. At 400 bushels per acre, his 40 acres of good soil produced 40 * 400 = 16,000 bushels of corn. If good soil produces 400 bushels per acre, clay - rich soil produces 400 / 2 = 200 bushels per acre. At 200 bushels per acre, his 20 acres of clay - rich soil produced 20 * 200 = 4,000 bushels of corn. Altogether, his land produced 16,000 + 4,000 = 20,000 bushels of corn.
The answer: 20000
Reverse engineering the question: Last year, Jorge planted corn on all of his 60 acres of property. Typically, corn grown on good soil yields 400 bushels per acre, but in clay-rich soil, the yield is only half as much per acre as in good soil. One-third of Jorge's 60 acres of land is clay-rich soil and the rest is good soil. How many bushels of corn did Jorge's land yield last year?


Reasoning and answer: First subtract the coupon amount from the price of the food: $7.50 - $2.50 = $5.00. Then subtract 20% from 100% to find out what percentage of the reduced price Carla pays: 100% - 20% = 80%. Now multiply the price after the coupon by the percentage Carla pays to find the final price: $5.00 * .8 = $4.00.
The answer: 4
What was the question?
Question: Carla's order at Mcdonald's costs $7.50, but she has a coupon for $2.50. If she gets an additional 20% discount for being a senior citizen, how much does she pay for her order in dollars total?


Kathleen saved $21 + $46 + $45 = $112. Kathleen’s aunt did not give Kathleen any money because $112 is not greater than $125. Kathleen spent $12 + $54 = $66. Kathleen has $112 - $66 = $46 remaining.
The answer: 46
Reverse engineering the question: Kathleen saved $21 in June, $46 in July, and $45 in August. Then Kathleen spent $12 on school supplies and $54 on new clothes. Kathleen’s aunt said she would give Kathleen $25 if Kathleen saves more than $125. How much money does Kathleen have left?


Nurse Missy has 12 * (1 / 3) = 4 special needs patients. She has 12 - 4 = 8 standard care patients. Special needs patients take 20% longer to serve, which means serving takes 1.2 * 5 = 6 minutes per patient. To serve dinner to all of her standard care patients, it will take 5 * 8 = 40 minutes. To serve dinner to all of her special needs patients, it will take 6 * 4 = 24 minutes. In total, it will take 40 + 24 = 64 minutes to serve dinner to all of her patients.
The answer: 64
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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Nurse Missy is attending to the needs of 12 patients in her hospital ward. Most of her patients require standard care, but one-third of her patients have special dietary requirements, which increases the serving time by 20%. At dinner time, she brings each patient their meal. It takes 5 minutes to serve each standard care patient. How long does it take, in minutes, for Missy to serve dinner to all of her patients?