Adam gave away 18 / 3 = 6 magnets. Adam had 18 - 6 = 12 magnets left. Peter has 12 * 2 = 24 magnets.
The answer: 24
Reverse engineering the question: Adam has 18 magnets. He gave away a third of the magnets, and he still had half as many magnets as Peter. How many magnets does Peter have?


Reasoning and answer: Mandy's brother's age is 3 years x 4 = 12 years old. Her sister's age is 12 years - 5 years = 7 years old. The age difference between Mandy and her sister is 7 years - 3 years = 4 years.
The answer: 4
What was the question?
Question: Mandy is 3 years old. Her brother is 4 times as old as she is. Her sister is 5 years younger than her brother. What is the age difference between Mandy and her sister?


Jenny spent 1 - 3 / 7 = 4 / 7 of her money. Since 4 / 7 is equal to $24, then 1 / 7 is equal to $24 / 4 = $6. So, Jenny originally had $6 x 7 = $42. Therefore, half of her original amount of money is $42 / 2 = $21.
The answer: 21
Reverse engineering the question: Jenny had $24 left after spending 3/7 of her money. How much is half of her original amount of money?


Reasoning and answer: 13 rows, with 2 sections per row would contain 13 * 2 = 26 sections. If two students sat per section, there would be capacity for 26 * 2 = 52 students.
The answer: 52
What was the question?
Question: A type C school bus contains 13 rows of seats, with an aisle running down the middle of the bus, splitting each row into two sections. If the school only allowed two students to sit in each section, how many students could be seated on the bus?


First find the total distance of the east - west streets: 18 streets * 2 miles / street = 36 miles. Then find the total distance of the north - south streets: 10 streets * 4 miles / street = 40 miles. Then add the number of miles from each type of street to find the total distance: 36 miles + 40 miles = 76 miles. Then multiply that number by 5 to find the number of miles of cable needed: 76 miles street * 5 miles cable / mile street = 380 miles of cable. Then multiply that number by the cost of one mile of cable to find the total cost: 380 miles * $2000 / mile = $760,000.
The answer: 760000
Reverse engineering the question: Bill is laying power cable for a new neighborhood. There are going to be 18 east-west streets that are 2 miles long and 10 north-south streets that are four miles long. It takes 5 miles of cable to electrify 1 mile of street. If cable costs $2000/mile, what is the total cost of cable for the neighborhood?


The total number of pages is 180 + 100 = 280 pages. The number of pages Yasna needs to read every day for two weeks is 280 / 14 = 20 pages.
The answer: 20
Reverse engineering the question:
Yasna has two books. One book is 180 pages long, and the other book is 100 pages long. If Yasna wants to finish both of the books in two weeks, how many pages will Yasna need to read every day, if she reads an equal number of pages each day?