Heath planted 400 rows x 300 plants = 120,000 carrot plants. He planted 120,000 plants in 20 hours, or 120,000 / 20 = 6,000 plants per hour.
The answer: 6000
Reverse engineering the question: Heath spent his weekend helping at his uncle’s farm planting carrots. He planted 400 rows of carrots with 300 plants in each row. He used a machine to get the planting done and it took him 20 hours. How many carrots did he plant each hour?


Reasoning and answer: The first three episodes are 58 + 62 + 65 = 185 minutes long. In minutes, the four episodes last 4 x 60 = 240 minutes. Then, the fourth episode is 240 - 185 = 55 minutes long.
The answer: 55
What was the question?
Question: Jared wants to watch a series with four episodes. The first three episodes are 58 minutes, 62 minutes, and 65 minutes long respectively. If the four episodes last 4 hours, how long is the fourth episode?


One third as many adults as children is 45 / 3 = 15 adults. One third of adults wore blue, or 15 / 3 = 5 adults wore blue. Thus, the remaining 15 - 5 = 10 adults did not wear blue.
The answer: 10
Reverse engineering the question: At the Johnson family reunion, there were 45 children and one third as many adults. One third of the adults wore blue. How many adults did not wear blue?


Reasoning and answer: We have 60 minutes per hour. So, in 24 hours we have 60 * 24 = 1440 minutes. So, the volume of air Ross inhaled in 24 hours is: 17 breaths / minute * 5 / 9 L / breath * 1440 minutes = 122400 / 9 = 13600 liters. The volume of air inhaled is 13600 liters.
The answer: 13600
What was the question?
Question: Ross takes 17 breaths per minute by inhaling 5/9 liter of air to his lungs. What is the volume of air inhaled in 24 hours?


Jade spends $1600 x 75 / 100 = $1200 for living expenses. She spends $1600 x 1 / 5 = $320 for insurance. She spends a total of $1200 + $320 = $1520 for living expenses and insurance. So, she saves $1600 - $1520 = $80 per month.
The answer: 80
Reverse engineering the question: If Jade earns $1600 per month and spent 75% of it on living expenses, one-fifth on insurance, and saves the rest, how much does she save per month?


Aisha starts with 500 songs + 500 songs = 1000 songs added to her mp3 player in the first two weeks. After that Aisha adds twice that amount to her mp3 player, 1000 x 2 = 2000 songs added. She now has 1000 + 2000 = 3000 songs on her mp3 player. However, she decides she wants to remove 50 of them, 3000 - 50 = 2950 songs on her mp3 player.
The answer: 2950
Reverse engineering the question:
Aisha enjoys listening to music on her mp3 player. She starts with 500 songs on her mp3 player, then adds another 500 the week after that. She realizes her mp3 player has a large capacity for storing songs so she adds twice the amount she already had on her mp3 player. After a while, though, she decides that she doesn't like 50 of the songs and removes them. How many songs are on Aisha's mp3 player now?