Reasoning and answer: Susan's time was 30 seconds + 10 seconds = 40 seconds. Mary's time was 40 seconds * 2 = 80 seconds. Tiffany's time was 80 seconds - 7 seconds = 73 seconds. The total time for the team was 80 seconds + 40 seconds + 30 seconds + 73 seconds = 223 seconds.
The answer: 223
What was the question?
Question: 4 friends are running a 4 x 100 relay race. Mary ran first and took twice as long as Susan. Susan ran second and she took 10 seconds longer than Jen. Jen ran third and finished in 30 seconds. Tiffany ran the last leg and finished in 7 seconds less than Mary. How many seconds did it take the team to finish the race?


On Tuesday, 120 books were taken out 250 - 120 = 130 books. On Wednesday, 35 books were returned 130 + 35 = 165 books. On Thursday, 15 books were borrowed 165 - 15 = 150 books.
The answer: 150
Reverse engineering the question: There are 250 books inside a library. On Tuesday, 120 books are taken out to be read by children. On Wednesday, 35 books are returned. On Thursday, another 15 books are withdrawn from the library. How many books are now in the library?


Reasoning and answer: The number of women in the group is 3 women / child * 30 children = 90 women. The number of men in the group is 2 men / woman * 90 women = 180 men. The total number of people in the group is 180 men + 90 women + 30 children = 300 people.
The answer: 300
What was the question?
Question: A group of people contains men, women, and children. The number of men is twice the number of women, and the number of women is 3 times the number of children. If the number of children is 30, how many people does this group contain?


At 2 pm there are 2 inches of rain in the tank. At 6pm, there are 2 + 4 * 1 = 6 inches of rain in the tank. That means that there are 18 - 6 = 12 inches of tank that still need to be filled as of 6 pm. It will take 12 / 3 = 4 hours to finish filling the tank. The tank will be filled at 6 + 4 = 10pm.
The answer: 10
Reverse engineering the question: It is raining outside and Bill puts his empty fish tank in his yard to let it fill with rainwater. It starts raining at 1 pm. 2 inches of rainfall in the first hour. For the next four hours, it rains at a rate of 1 inch per hour. It then rains at three inches per hour for the rest of the day. If the fish tank is 18 inches tall, at what time will it be filled with rainwater.


Reasoning and answer: First find the total number of purple beads Carly needs: 50 rows * 20 beads / row = 1000 beads. Then find the total number of blue beads Carly needs: 40 rows * 18 beads / row = 720 beads. Then add the number of each color she needs to find the total number she needs: 1000 beads + 720 beads + 80 beads = 1800 beads. Then divide the number of beads by 10 to find the cost: 1800 beads / 10 beads / $1 = $180.
The answer: 180
What was the question?
Question: Carly is making a beaded corset. She's going to add 50 rows of purple beads with 20 beads per row, 40 rows of blue beads with 18 beads per row, and 80 gold beads. If beads cost $1 per 10 beads, how much do all the beads she bought cost?


Reasoning and answer: There are 3 couples in the club, so there are 3 * 2 = 6 people in couples in the club. Along with the singles and Ron and his wife, there are 6 + 5 + 2 = 13 people in the book club. There are 52 weeks in a year, so Ron gets to pick a new book 52 / 13 = 4 times a year.
The answer: 4
What was the question?
Question:
Ron is part of a book club that allows each member to take a turn picking a new book every week. The club is made up of three couples and five single people along with Ron and his wife. How many times a year does Ron get to pick a new book?