Martha spent 6 / 2 = 3 dollars. Martha and Doris spent 6 + 3 = 9 dollars. There were 15 + 9 = 24 dollars in the cookie jar at first.
The answer: 24
Reverse engineering the question: There was some money in the cookie jar. Doris spent $6 from the cookie jar. Martha spent half as much as Doris. If there were $15 left in the cookie jar, how much money, in dollars, was there in the cookie jar at first?


Reasoning and answer: Let x be the amount of rain in the first hour. It rained 2x + 7 inches in the second hour. x + 2x + 7 = 22. 3x + 7 = 22. 3x = 15. x = 5 inches.
The answer: 5
What was the question?
Question: In the second hour of a storm it rains 7 inches more than twice the amount it rained the first hour. The total amount of rain in the first two hours is 22 inches. How much did it rain in the first hour?


The capacity is 3000 * 8 = 24000. It can hold 24000 / 6 = 4000 6 megabyte pictures.
The answer: 4000
Reverse engineering the question: Pete's memory card can hold 3,000 pictures of 8 megabytes each. How many pictures can it hold of 6 megabytes each?


Reasoning and answer: Kevin begins the day with 15 phones and repairs 3 by the afternoon, so Kevin still has to repair 15 - 3 = 12 phones. A client drops off 6 additional phones that require fixing, increasing the total to 12 + 6 = 18 phones. If Kevin's coworker helps Kevin fix half of the phones, then each person needs to fix 18 / 2 = 9 phones.
The answer: 9
What was the question?
Question: Kevin repairs phones at his job. At the beginning of the day, Kevin has 15 phones that need to be repaired. By the afternoon, Kevin has successfully repaired 3 of the 15 phones and a client has dropped off 6 more phones that need fixing. If a coworker of Kevin's offers to help him and fix half of the damaged phones, how many phones will each person need to repair?


Mickey runs around the block twice because half of 4 is 2. Mickey runs 400 meters in total because 2 times 200 equals 400. Johnny runs 800 meters because 4 times 200 equals 800. In total, they run 1200 meters because 400 plus 800 equals 1200. On average, they run 600 meters because 1200 divided by 2 equals 600.
The answer: 600
Reverse engineering the question: Mickey and Johnny are having a contest to see who can run around their block the most. One time around the block equals 200 meters. Johnny runs around the block 4 times. Mickey runs around the block half as many times as Johnny. What is the average distance run by Johnny and Mickey?


The second flight had 20 * 2 = 40 steps. The third had 40 - 10 = 30 steps. So in total, he climbed 20 + 40 + 30 = 90 steps. So he climbed 90 * .5 = 45 feet.
The answer: 45
Reverse engineering the question:
John climbs 3 staircases. The first staircase has 20 steps. The next has twice as many steps as the first. The final staircase has 10 fewer steps than the second one. Each step is 0.5 feet. How many feet did he climb?