There are 20 - 2 = 18 floors that are each 3 meters high. So the first 18 floors is 18 x 3 = 54 meters high. The last two floors are each 3 + 0.5 = 3.5 meters high. So the total height of the last two floors is 3.5 x 2 = 7 meters. Therefore, the building is 54 + 7 = 61 meters high.
The answer: 61
Reverse engineering the question: A building has 20 floors. Each floor is 3 meters high, except for the last two floors. The last two floors are each 0.5 meters higher. How tall is the building?


Reasoning and answer: If Allie's bowl contained two more grapes than Rob's bowl, there were 25 + 2 = 27 grapes in Allie's bowl. If Allyn's bowl contained four more grapes than Allie's bowl, there were 27 + 4 = 31 grapes in Allyn's bowl. The total combined number of grapes in all three bowls is 25 + 27 + 31 = 83 grapes.
The answer: 83
What was the question?
Question: Allie, Rob, and Allyn each bought a bowl of grapes. Allie's bowl contained two more grapes than Rob's bowl. Allyn's bowl contained four more grapes than Allie's bowl. If Rob's bowl contained 25 grapes, what is the total combined number of grapes in all three bowls?


Find the price of each group of fruit. 12 apples * $2 per apple = $24. 4 bananas * $1 per banana = $4. 3 oranges * $4 per orange = $12. $24 + $4 + $12 = $40 in total that was spent. 12 + 4 + 4 = 20 total fruits bought. $40 / 20 fruits = $2 per fruit.
The answer: 2
Reverse engineering the question: Marcia wants to buy some fruit. Apples cost $2, bananas cost $1, and oranges cost $3. If Marcia buys 12 apples, 4 bananas and 4 oranges, what is the average cost of each piece of fruit in dollars?


Reasoning and answer: If the first building was designed to have 4000 units, the second building, which had 2 / 5 times as many units as the first building, was to have 2 / 5 * 4000 = 1600 more units. Together, the first and the second building had to have 1600 + 4000 = 5600. The third building was to have 120 / 100 * 1600 = 1920 units. Altogether, Daleyza won a project that required her to construct 5600 + 1920 = 7520 units.
The answer: 7520
What was the question?
Question: Daleyza won a house construction project that involved the construction of three houses with several units. The first building was designed to have 4000 units, the second building 2/5 times as many units as the first building, and the third building was to have 20% more units than the second building. How many units were Daleyza contracted to build?


If the electric oven uses power worth $500 in a month, twice what Joseph pays for the power the water heater uses, Joseph pays 1 / 2 * $500 = $250 for power used by the water heater. The total amount of money that Joseph pays for the power used by the water heater and the electric oven is $250 + $500 = $750. The total amount of money that Joseph pays for the energy used by the refrigerator is three times the amount he pays for the power used by the water heater, a total of 3 * $250 = $750. For the three gadgets, Joseph pays $750 + $750 = $1500 for the power they use.
The answer: 1500
Reverse engineering the question: Joseph has a refrigerator, a water heater in his house, and an electric oven that consumes power at different rates. The total amount of money that Joseph pays for the energy used by the refrigerator is three times the amount he pays for the power used by the water heater. If the electric oven uses power worth $500 in a month, twice what Joseph pays for the power the water heater uses, calculate the total amount he pays for the power used by these gadgets.


The sell reduced the price of each pin by 20 * .15 = $3. So he paid 20 - 3 = $17 per pin. So the total cost was 17 * 10 = $170.
The answer: 170
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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John decided to buy 10 pins for himself. They are normally $20 each but they were on sale for 15% off. How much did he spend on pins?