Tom had 10 x 5 = 50 miniature racing cars. Tom gave 50 x 1 / 5 = 10 miniature racing cars to each of his two nephews. So, he gave a total of 10 x 2 = 20 cars to his two nephews. Therefore, Tom is left with 50 - 20 = 30 miniature racing cars.
The answer: 30
Reverse engineering the question: Tom bought 10 packages of miniature racing cars. Each package contains five cars. He gave each of his two nephews 1/5 of the cars. How many miniature racing cars are left with Tom?


Reasoning and answer: First convert the number of farthings Gerald has to pfennigs by dividing by the exchange rate: 54 farthings / 6 farthings / pfennig = 9 pfennigs. Then subtract the cost of the meat pie to find how many pfennigs Gerald has left: 9 pfennigs - 2 pfennigs = 7 pfennigs.
The answer: 7
What was the question?
Question: Gerald wants to buy a meat pie that costs 2 pfennigs. Gerald has 54 farthings, and there are 6 farthings to a pfennig. How many pfennigs will Gerald have left after buying the pie?


With two substitutions, 11 + 2 = 13 players from the team played the game in the first half. In the second half, the team made twice the number of substitutions it made in the first half, a total of 2 * 2 = 4 substitutions. The total number of players who played the game is 13 + 4 = 17. If the soccer team had 24 players prepared for the soccer game, the number of players who did not play the game is 24 - 17 = 7 players.
The answer: 7
Reverse engineering the question: A soccer team had 24 players prepared for a soccer game. The first half saw 11 players start the game with 2 substitutions made. In the second half, the team made twice as many substitutions as it made in the first half. How many players on the team did not play that day?


Reasoning and answer: Tablecloth = 102 * 54 = 5508 square inches. Napkins = 8 * (6 * 7) = 336 square inches. 5508 + 336 = 5844 square inches. Sally will need 5844 square inches of material to make the tablecloth and 8 napkins.
The answer: 5844
What was the question?
Question: Sally needs to make a tablecloth that measures 102 inches by 54 inches. She also needs to make 8 napkins that are 6 by 7 inches. How many square inches of material will Sally need to make the tablecloth and the 8 napkins?


Marissa used a total of 4.5 - 1 = 3.5 feet of ribbon to the boxes. Thus, there were 3.5 / 0.7 = 5 boxes.
The answer: 5
Reverse engineering the question: Marissa has 4.5 feet of ribbon that she wants to use to tie some boxes. If 1 foot of ribbon is left after Marissa uses 0.7 feet of ribbon to tie each box, find out how many boxes she tied?


He has 3 apples and 4 bananas, so he has 3 + 4 = 7 pieces of fruit. He needs to buy 12 fruit - 7 fruit = 5 oranges.
The answer: 5
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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Mark is looking to buy a total of 12 pieces of fruit at the store. He has already chosen 3 apples. He has also selected a bunch of bananas containing 4 bananas. How many oranges does he need to pick out to have 12 total pieces of fruit?