After one year it earns $10 in interest because 100 x .1 = 10. It has $120 in it after a year because 100 + 10 + 10 = 120. In the second year it earns $12 in interest because 120 x .1 = 12. In the second year it has $142 in it because 120 + 12 + 10 = 142.
The answer: 142
Reverse engineering the question: Steve has a bank account that earns 10% interest every year. He puts $100 in it, and then 10 each year. How much money is in it after two years?


Reasoning and answer: The band played 5 + 7 = 12 songs in their first two sets. They have 30 - 12 = 18 songs left for the third set, fourth set and encore. Since they played 2 songs in the encore, they have 18 - 2 = 16 songs to play on the third and fourth sets. They will play 16 / 2 = 8 songs on average over the third and fourth sets.
The answer: 8
What was the question?
Question: The school band has 30 songs in their repertoire. The band played 5 songs in their first set and 7 in their second set. The band will play 2 songs for their encore. Assuming the band plays through their entire repertoire, how many songs will they play on average in the third and fourth sets?


She needs 10 * 8 = 80 apples to make the pies. So she has to buy 80 - 50 = 30 more apples.
The answer: 30
Reverse engineering the question: Mary wants to bake 10 apple pies for a charity event. Each pie needs 8 apples and she already harvested 50 apples from the trees in her garden. How many more apples does she need to buy to make all 10 pies?


Reasoning and answer: Jessica will drive 20 minutes, twice every school day (to and from school), so 20 minutes x 2 trips = 40 minutes each day. There are 60 minutes in 1 hour, so 50 hours of driving x 60 minutes / hour = 3,000 minutes. If you take the 3,000 minutes she needs to drive / 40 minutes driving each day = 75 school days to drive 50 hours.
The answer: 75
What was the question?
Question: Jessica just got her driving permit. She must complete 50 hours of driving with a parent to get her driver’s license. It takes 20 minutes to drive to school. If she drives to and from school every day, how many school days will it take Jessica to meet the 50-hour driving requirement?


The first round will result in 1000 * 10% = 100 employee layoffs. There are 1000 - 100 = 900 employees remaining. The second round will result in 900 * 10% = 90 employee layoffs. There are 900 - 90 = 810 employees remaining. The third round will result in 810 * 10% = 81 employee layoffs. The total number of of employees laid off is 100 + 90 + 81 = 271.
The answer: 271
Reverse engineering the question: A company has 1000 employees. There will be three rounds of layoffs. For each round of layoff, 10% of the remaining employees will be laid off. How many employees will be laid off in total?


There are 60 / 5 = 12 5 - minute intervals in 1 hour. 12 * 4 = 48 snowflakes fell in 1 hour. There were 58 - 48 = 10 snowflakes at first.
The answer: 10
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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There were some snowflakes at first. It snowed an additional 4 snowflakes every 5 minutes. If there were 58 snowflakes after 1 hour, how many snowflakes were there at first?