Reasoning and answer: First find how much the store makes in profit: $20 * 0.30 = $6 for profit. Then find the regular selling price: $20 + $6 = $26 total price. Then multiply the regular price by the discount to get $26 * 0.50 = $13 for the final price.
The answer: 13
What was the question?
Question: Corna wants to buy a shirt. The store buys the shirt for $20, but charges 30% for profit. However, the shirt is on sale for 50% off the selling price. What is the price now?


Each episode is 20 minutes long, and there are 90 episodes, so the series takes 20 minutes per episode * 90 episodes = 1800 minutes to watch. 1800 minutes / 60 minutes per hour = 30 hours to watch the series. Tom can watch 2 hours of TV a day, so it will take him 30 hours / 2 hours per day = 15 days to watch the entire series.
The answer: 15
Reverse engineering the question: Tom is binge-watching a show on Netflix. The show has 90 episodes, each one of which is 20 minutes long because there are no commercials. If Tom can spend two hours a day watching the show, how many days will it take him to finish watching the show?


Reasoning and answer: Katy read twice as many books in July as she did in June, so she read 2 * 8 = 16 books in July. She read three fewer books in August than she did in July, so she read 16 - 3 = 13 books in August. So, including June, she read 8 + 16 + 13 = 37 books total.
The answer: 37
What was the question?
Question: Katy participated in a summer reading program at her local library. She read 8 books in June, twice as many in July and three fewer in August than she did in July. How many books did Katy read during the summer?


When Linda's mother gave her 2 more dimes, the total number of dimes increased to 2 + 2 = 4 dimes. She also increased the total number of quarters to 6 + 10 = 16 after her mother gave her 10 more. The total number of dimes and quarters she has is 16 + 4 = 20. Linda's mother also gave her twice as many nickels as she has, a total of 2 * 5 = 10 nickels. The total number of nickels she has increased to 10 + 5 = 15. Altogether, Linda has 20 + 15 = 35 coins.
The answer: 35
Reverse engineering the question: Linda's bag has 2 dimes, 6 quarters, and 5 nickels. Her mother gives her 2 more dimes, 10 quarters, and twice as many nickels as she has. How many coins does she have altogether?


Reasoning and answer: Will paid $30 for his shoes but then returned them and got 90% of the money back, so he lost 10% of the money, which means 10 / 100 * $30 = $3 is gone. Will spent $9 + $11 + $3 = $23. Will started with $74 - $23 that he spent = $51 remaining.
The answer: 51
What was the question?
Question: Will's mom gave him $74 to go shopping. He bought a sweater for $9, a T-shirt for $11 and a pair of shoes for $30. He then returned his shoes for a 90% refund. How much money does Will have left?


Reasoning and answer: For every 5 kangaroos, there is one koala, meaning for the 180 kangaroos, there are 180 / 5 = 36 koalas. Altogether, there are 36 + 180 = 216 koalas and kangaroos.
The answer: 216
What was the question?
Question:
Legoland has 5 kangaroos for each koala. If Legoland has 180 kangaroos, how many koalas and kangaroos are there altogether?