Let x = the number of weeks. 60 + 9x = 90 + 3x to set them equal. 9x = 30 + 3x. 6x = 30. x = 5. In 5 weeks they will have equal money.
The answer: 5
Reverse engineering the question: Carol has $60 and saves $9 per week. Mike has $90 and saves $3 per week. How many weeks before Carol and Mike both have the same amount of money?


Reasoning and answer: Meryll has written 35 questions x 2 / 5 = 14 multiple - choice questions. While she has written 15 questions x 1 / 3 = 5 problem - solving questions. The total number of questions that Meryll has to write is 35 questions + 15 questions = 50 questions. Meryll has written a total of 14 questions + 5 questions = 19 questions. Hence, she needs to write 50 questions - 19 questions = 31 questions more.
The answer: 31
What was the question?
Question: Meryll wants to write 35 multiple-choice questions and 15 problem-solving questions for her Chemistry class. She already has written 2/5 of the multiple-choice and 1/3 of the problem-solving questions. How many more questions does she need to write for both multiple-choice and problem-solving?


Since a day has 24 hours, the project was to take 24 * 4 = 96 hours. Bill took 6 seven - hour naps during the four days, a total of 6 * 7 = 42 hours. The time he spent working on the project is 96 - 42 = 54 hours.
The answer: 54
Reverse engineering the question: Bill had to finish a project from work that was to take him 4 days. If he took 6 seven-hour naps in the four days, how long did he spend working on the project?


Reasoning and answer: He is 5 * 12 + 6 = 66 inches tall before the growth spurt. After growing he is now 66 + 6 = 72 inches.
The answer: 72
What was the question?
Question: Steve is 5'6". He grows 6 inches. How tall is he in inches?


Emily spends 3 episodes * 25 minutes = 75 minutes watching TV. Emily spends 4.5 hours * 60 minutes = 270 minutes sleeping. Emily spends 2 movies * 1.75 hours * 60 minutes = 210 minutes watching movies. The total time spent doing activities is 75 + 270 + 210 = 555 minutes. The total length of the flight is 10 hours * 60 minutes = 600 minutes. The number of minutes remaining in the flight is 600 - 555 = 45 minutes.
The answer: 45
Reverse engineering the question: Emily is on a flight from New York to Hawaii that is 10 hours long. To kill time, she watches 3 TV episodes that are each 25 minutes long. Then she sleeps for 4 and a half hours. Then she watches 2 movies that are each an hour and 45 minutes long. After doing all these things, assuming there is no break time between activities, how many more minutes are left in the flight before Emily reaches Hawaii.


The quilt is 7 * 8 = 56 square feet. So it cost 40 * 56 = 2240.
The answer: 2240
Reverse engineering the question:
John has to get a new blanket. He decides to have a 7 foot by 8-foot quilt made. The quilt costs $40 per square foot. How much does his quilt cost?