Reasoning and answer: 15% of $80 = (15 / 100) * $80 = $12. The dollar amount of the discount is $12 so he is supposed to pay just $80 - $12 = $68.
The answer: 68
What was the question?
Question: Barry goes to a shop to buy a shirt he'd been admiring for quite some time. He tells the attendant that it's his birthday so she decides to give him a 15% special discount. The price tag on the shirt says $80. How much is he supposed to pay now, considering the special discount?
In 5 hours the car can drive 8 * 5 = 40 miles. One cycle of driving and pause takes 5 + 1 = 6 hours. In 13 hours this cycle can fit 13 / 6 = 2 full cycles with a remainder of 1 hour. Two cycles will last for 2 * 6 = 12 hours. During two full cycles, the car will drive 40 * 2 = 80 miles. So there is 13 - 12 = 1 remaining hour when the car can drive. That means during 13 hours the car will be able to drive 80 + 8 = 88 miles.
The answer: 88
Reverse engineering the question: An old car can drive 8 miles in one hour. After 5 hours of constant driving, the car needs to get cooled down which takes 1 hour. How many miles can this car drive in 13 hours?
Reasoning and answer: Melanie set aside 20 x 3 / 4 = 15 brownies from each batch for a bake sale. So, there are 20 - 15 = 5 brownies that are not for bake sale from each batch. Out of the 5, 5 x 3 / 5 = 3 brownies are kept in a container from each batch. Thus, 5 - 3 = 2 brownies are given out from each batch. Therefore, a total of 2 x 10 = 20 brownies are given out from the 10 batches.
The answer: 20
What was the question?
Question: Melanie baked 10 batches of brownies, with 20 brownies in each batch. She set aside 3/4 of the brownies in each batch for a bake sale, put 3/5 of the remaining in a container, and gave out the rest. How many brownies are given out?
The number of black shirts is 3 5 = 15. The number of yellow shirts is 3 2 = 6. Mandy bought 15 + 6 = 21 shirts.
The answer: 21
Reverse engineering the question: Mandy bought 3 packs of black shirts and 3 packs of yellow shirts for her tennis team. The black shirts come in packs of 5, and the yellow shirts come in packs of 2. How many shirts did Mandy buy in all?
Reasoning and answer: Each hour contains 60 minutes, so after 2 hours he took 2 * 60 = 120 minutes. If each question takes two minutes, then he answered 120 / 2 = 60 questions. Unanswered questions is 100 - 60 = 40 questions.
The answer: 40
What was the question?
Question: Grayson has 100 questions on a test. He answers some of the questions for 2 hours, taking two minutes for each answer, then realizes he doesn't know the rest of the questions. How many questions does Grayson leave unanswered when he submits his test?
Reasoning and answer: Half of the number of Randy's mango trees is 60 / 2 = 30 trees. So Randy has 30 - 5 = 25 coconut trees. Therefore, Randy has 60 + 25 = 85 treeson his farm.
The answer: 85
What was the question?
Question:
Randy has 60 mango trees on his farm. He also has 5 less than half as many coconut trees as mango trees. How many trees does Randy have in all on his farm?