Reasoning and answer: His total expenditure so far is $50 + $35 + $15 = $100. To make a profit of 10%, he has to make a total of $100 + ($100 * (10 / 100) = $110 from sales. To make $110 from the sales of 10 bags, each bag should cost $110 / 10 = $11.
The answer: 11
What was the question?
Question: While cultivating a small farm, a farmer spent $50 on corn seeds, $35 on fertilizers and pesticides, and $15 on labor. After a successful harvest, he was able to gather 10 bags of corn. How much should he sell each bag, if he wants to make a profit of 10%?


The carpenter initially has 8 x 5 = 40 blocks of wood. So he still lacks 80 - 40 = 40 blocks of wood. Therefore he still needs 40 / 5 = 8 logs of wood.
The answer: 8
Reverse engineering the question: A carpenter is building a house. He needs 80 woodblocks to build it. If he has 8 logs that can make five woodblocks each, how many logs does the carpenter still need?


Reasoning and answer: The reseller wants to get $3000 x 15 / 100 = $450 profit. Thus, she needs to sell it for $3000 + $450 = $3450.
The answer: 3450
What was the question?
Question: A luxury bag costs $3000. A reseller wants to get a 15% profit. How much should she sell the bag?


In five years, Angelina will be 40 years old, meaning currently she is 40 - 5 = 35 years old. Since Angelina is 35 years old right now, and she is four years older than Justin, it means Justin is 35 - 4 = 31 years old.
The answer: 31
Reverse engineering the question: Angelina is 4 years older than Justin is now. In 5 years, Angelina will be 40 years old. Calculate the age of Justin currently.


Reasoning and answer: First find the number of eggs that each turtle successfully hatches: 20 eggs * 40% = 8 eggs. Then multiply the number of eggs per turtle by the number of turtles to find the total number of eggs: 8 eggs / turtle * 6 turtles = 48 turtles.
The answer: 48
What was the question?
Question: Each turtle lays a clutch of 20 eggs. If 40% of the eggs successfully hatch, how many hatchlings do 6 turtles produce?


Reasoning and answer: Accommodation is 15% * $1000 = $150. Food is     30% * $1000 = $300. Entertainment is  25% * $1000 = $250. Coursework materials are thus $1000 - ($150 + $300 + $250) = $300.
The answer: 300
What was the question?
Question:
James is a first-year student at a University in Chicago. He has a budget of $1000 per semester. He spends 30% of his money on food, 15% on accommodation, 25% on entertainment, and the rest on coursework materials. How much money does he spend on coursework materials?