Reasoning and answer: He got 4 * 50 = $200. That means he was able to buy 200 / 20 = 10 birds. Since each bird has 2 wings he got 10 * 2 = 20 wings.
The answer: 20
What was the question?
Question: John decides to buy some birds. He got 50 dollars from each of his 4 grandparents. If each bird costs $20, how many wings did all the birds have?


The rental fee is 5000 * .1 = $500 per week. So it cost 500 * 4 = $2000. His friend pays 2000 * .4 = $800. So he pays 2000 - 800 = $1200.
The answer: 1200
Reverse engineering the question: John's camera broke so he decided to rent one for 4 weeks. It was a $5000 camera and the rental fee was 10% of the value per week. His friend who was there when it broke agreed to pay 40% of the rental fee. How much did John pay?


Reasoning and answer: There are a total of 4 teams * 10 members per team = 40 team members. Each person receives 1 pair of competing roller skates + 1 pair of backup roller skates = 2 pairs of roller skates. So there are a total of 40 team members * 2 pairs of roller skates per team member = 80 roller skates. There were therefore 80 roller skates * 3 sets of laces per pair of roller skates = 240 sets of laces handed out.
The answer: 240
What was the question?
Question: At a roller derby, 4 teams are competing. Each team is made up of 10 members, and each member needs a pair of roller skates to compete in and another pair of skates as a backup. None of the skates have laces yet, so each member is offered 3 sets of laces per pair of skates. How many sets of laces have been handed out?


The squirrel steals 1 / 2 cup of birdseed every week, so the birds eat 2 - 1 / 2 = 1 1 / 2 cups of birdseed. Each cup feeds 14 birds, so Ivan’s bird feeder feeds 14 * 1 1 / 2 = 21 birds weekly.
The answer: 21
Reverse engineering the question: Ivan has a bird feeder in his yard that holds two cups of birdseed. Every week, he has to refill the emptied feeder. Each cup of birdseed can feed fourteen birds, but Ivan is constantly chasing away a hungry squirrel that steals half a cup of birdseed from the feeder every week. How many birds does Ivan’s bird feeder feed weekly?


Reasoning and answer: She fills it 8 times for the flour because 2 / (1 / 4) = 8. She fills it 4 times for the white sugar because 1 / (1 / 4) = 4. She fills is 2 times for the oil because (1 / 2) / (1 / 4) = 2. She fills it 1 time for the brown sugar because she needs exactly 1 / 4 of a cup. She fills is 15 times because 8 + 4 + 2 + 1 equals 15.
The answer: 15
What was the question?
Question: Felicia is baking a cake. She needs 2 cups of flour, a cup of white sugar, a 1/4 cup of brown sugar, and a 1/2 cup of oil. Her only measuring scoop is 1/4 cup. How many times does she fill it to complete the measurements?


Reasoning and answer: For every acre of grass, the farmer can harvest 560 / 5 = 112 bales of hay each month. This year, the farmer has 7 + 5 = 12 acres of grass. He can expect to harvest 12 x 112 = 1344 bales of hay per month. The total hay production this year is 1344 * 12 = 16128. From September to December, the farmer would have to feed his horses for a total of 30 + 31 + 30 + 31 = 122 days. Each day his horse eats a total of 3 * 9 = 27 bales of hay. For the 122 days, the horses will eat a total of 27 * 122 = 3294 bales. The total number of bales remaining will be 16128 - 3294 = 12834.
The answer: 12834
What was the question?
Question:
A hay farmer harvested 560 bales of hay from 5 acres of grass per month last year. This year, he planted an additional 7 acres of grass. If the farmer also owns 9 horses and each horse consumes 3 bales of hay a day, how many bales of hay would the farmer have left by the end of December if he starts feeding them this year's hay beginning the first day of September?