The total number of books is 9 books + 7 books = 16 books. The cost of the books is $11 / book × 16 books = $176. The cost of the magazines is $1 / magazine × 3 magazines = $3. Whitney spent $3 + $176 = $179 in all.
The answer: 179
Reverse engineering the question: Whitney bought 9 books about whales and 7 books about fish. She also bought 3 magazines. Each book cost $11 and each magazine cost $1. How much did Whitney spend in all?


Reasoning and answer: The length of Alex's yard is 30 / 6 = 5 yards. The length of Derrick's yard is 5 * 2 = 10 yards.
The answer: 10
What was the question?
Question: Derrick measures the length of his yard. The length of Alex's yard is half the size of Derrick's and the length of Brianne's yard is 6 times the size of Alex's. If Brianne's yard is 30 yards long, how long is Derrick's yard, in yards?


Borris uses 90 x 2 = 180 kilograms of grapes per year. The increase of kilograms of grapes he needed per year is 180 x 0.20 = 36. Therefore, Borris needs 180 + 36 = 216 kilograms of grapes in a year.
The answer: 216
Reverse engineering the question: Borris liquor store uses 90 kilograms of grapes every 6 months. He is thinking of increasing his production by twenty percent. How many grapes does he need in a year after increasing his production?


Reasoning and answer: 4 hours and 30 minutes is the same as 4 * 60 + 30 = 270 minutes. At 90 minutes per movie, Grandpa could watch a total of 270 / 90 = 3 entire movies in 4 hours and 30 minutes. On Wednesday, he watched 2 * 3 = 6 movies. Thus, during these two days, he could have watched as many as 3 + 6 = 9 movies.
The answer: 9
What was the question?
Question: Grandpa Lou enjoys watching movies on the Hallmark channel, where every movie lasts 90 minutes. If, on Tuesday, he watched several full-length movies on the Hallmark channel for a total of 4 hours and 30 minutes, and then on Wednesday he watched on the same channel twice as many movies as he did on Tuesday. What is the maximum number of full-length movies Grandpa could have watched during these two days?


If Lori has 15 times as many beanie babies as Sydney, Sydney has 300 / 15 = 20 beanie babies. Together, they have 20 + 300 = 320 beanie babies.
The answer: 320
Reverse engineering the question: Lori owns 15 times as many beanie babies as Sydney. If Lori has 300 beanie babies, how many beanie babies do they have in total?


Jay invited 22 guests and Gloria invited 36 so they invited 22 + 36 = 58 guests. They also each wanted a flag so in total they would need 1 + 1 + 58 = 60 flags. The craft store has them on sale at 5 for $1.00 and they need 60 flags so the flags will cost them 60 / 5 = $12.00.
The answer: 12
Reverse engineering the question:
Jay & Gloria were hosting a 4th of July party at their house. Jay invited 22 people and Gloria invited 36. They wanted to buy small American flags for everyone. The craft store was having a sale on small flags, 5 flags for $1.00. If they wanted all of their guests to have a flag and they also wanted 1 flag each, how much would they spend at the craft store?