After 10 years, growing at the rate of 3 inches every year, Haley will have grown by 3 * 10 = 30 inches. If she is currently 20 inches tall, her height after 10 years will be 20 + 30 = 50 inches.
The answer: 50
Reverse engineering the question: Haley grows at the rate of 3 inches every year. If she is currently 20 inches tall, what will be her height after 10 years?


Reasoning and answer: If there are 8 more solar systems for every planet in the galaxy, there are 8 + 1 = 9 solar systems for every planet. Since the number of planets is 20, there are 20 * 9 = 180 solar systems in the galaxy. Altogether, there are 180 + 20 = 200 solar systems and planets in the galaxy.
The answer: 200
What was the question?
Question: Today, at the school science lesson, Jake learned that there are 8 more solar systems for every planet in the galaxy. If there are 20 planets in the galaxy, how many solar systems and planets are there altogether?


He has 3 * 4 = 12 trees. So he has 12 * 5 = 60 apples. So he sells the apples for 60 * .5 = $30.
The answer: 30
Reverse engineering the question: John plants a plot of 3 trees by 4 trees. Each tree gives 5 apples. He sells each apple for $.5. How much money does he make, in dollars?


Reasoning and answer: If the first 100 miles took one hour, then let's say the next 300 miles took x hours. if 100 miles = 1 hour, then 300 miles = x. To find the number of hours traveled for the 300 miles, x = 300 * 1 / 100. x = 3 hours. The total number of hours will be 3 + 1 = 4 hours.
The answer: 4
What was the question?
Question: Emery's family decides to travel for a weekend trip. They drive the first 100 miles in 1 hour. They stop at a McDonald's and then continue the rest of the journey for 300 miles. What's the total number of hours they traveled?


There are 26 total desserts because 14 plus 12 equals 26. Each student gets 2 desserts because 26 divided by 13 equals 2.
The answer: 2
Reverse engineering the question: The teacher brings in 14 mini-cupcakes and 12 donut holes for the class. There are 13 students in the class. If each student gets the exact same amount, how many desserts does each student get?


He had 80 - 20 = 60 after the donation. He kept 60 / 2 = 30 after giving half to his brother. So he has 30 * 3 = 90 coins. He then does 1 more donation and has 90 - 10 = 80 coins left.
The answer: 80
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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Jake amasses a fortune of 80 bitcoin. He donates 20 bitcoins to charity. He then gives half of all the bitcoins to his brother. After that, he triples the number of bitcoins he has. Then he donates another 10 coins. How many coins does he have?