Book 1 was $12.50 and book 2 was $15.00 so 13.00 + 15.00 = $28.00. He was buying 4 books, so these 2 were 25% off so 28.00 * .25 = $7.00. These two books came out to 28 - 7 = $21.00. Books 3 & 4 were both $10 each so 2 * 10 = $20.00. When you add all 4 books together, 21 + 20 = $41.00. To get free shipping he would need to spend 50 - 41 = $9.00 more on books.
The answer: 9
Reverse engineering the question: Connor wanted to order some new books to read. The website was offering free shipping over $50.00. They also had a deal that when you buy 4 books; the first two were 25% off. Book 1 cost 13.00 and Book 2 cost 15.00. Book 3 & 4 were both $10.00 each. How much more money did Connor need to spend to receive free shipping?


Reasoning and answer: Mary spent 100 / 4 = 25 dollars on a new video game. So, after the video game purchase, Mary was left with 100 - 25 = 75 dollars. Mary then bought swimming goggles for 75 / 5 = 15 dollars. Mary had 75 - 15 = 60 dollars left.
The answer: 60
What was the question?
Question: On Mary's birthday, her brother surprised her with $100. She spent a quarter of it on a new video game and then used a fifth of what was left on swimming goggles. How much money did she have left?


He picked 2 bushels of corn and each bushel weighs 56 pounds so he picked 2 * 56 = 112 pounds of corn. Each ear of corn weighs .5 pounds and he has 112 pounds of corn so he picked 112 / .5 = 224 ears of corn.
The answer: 224
Reverse engineering the question: A bushel of corn weighs 56 pounds and each individual ear of corn weighs .5 pounds. If Clyde picked 2 bushels of corn over the weekend, how many individual corn cobs did he pick?


Reasoning and answer: Blue = 516 * (1 / 3) = 172 cars. Red = 516 * (1 / 2) = 258. Black = 516 - (172 + 258) = 86. There are 86 black cars on the lot.
The answer: 86
What was the question?
Question: There are 516 cars in a parking lot. One-third are blue, one-half are red, and the rest are black. How many black cars are on the lot?


The total number of messages sent last week on Monday and Tuesday is 300 + 200 = 500 messages. On Wednesday, the number of messages was 300 more than the previous day, a total of 300 + 200 = 500 messages. In total, in the three days, the number of messages sent is 500 + 500 = 1000 messages,. On Thursday, the number of messages sent was two times the number sent on Wednesday, totaling 2 * 500 = 1000 messages. In the four days. the number of messages sent is 1000 + 1000 = 2000.
The answer: 2000
Reverse engineering the question: A Whatsapp group has members sending messages every day sharing about how each one's day was. Last week, 300 messages were sent by the members on Monday, 200 messages on Tuesday, 300 more messages on Wednesday than the previous day, and two times as many messages on Thursday as there were on Wednesday. Calculate the number of messages sent in the Whatsapp group after the four days.


He earned 5 x $100 = $500 for the large painting. And he earned 8 x $80 = $640 for the small paintings. Therefore, he earned a total of $500 + $640 = $1140 in all.
The answer: 1140
Reverse engineering the question:
Michael loves to paint and sells his creations. He charges $100 for a large painting and $80 for a small painting. At his last art show, he sold 5 large paintings and 8 small paintings. How much did he earn in all?