For 10 whole bottles, you will need 10 * 2 = 20 cups of water. With 5 half - capacity bottles, it requires 5 * 1 = 5 cups of water. In total, you need to have 25 + 5 = 30 cups of water to fill them all.
The answer: 30
Reverse engineering the question: A bottle can hold 2 cups of water. How many cups of water are needed to fill up 10 whole bottles and 5 half-capacity bottles?


Reasoning and answer: One chair costs $140 x 1 / 7 = $20. Four chairs cost $20 x 4 = $80. So a table and 4 chairs cost $140 + $80 = $220.
The answer: 220
What was the question?
Question: A chair costs 1/7 of the cost of a table. If a table costs $140, how much will it cost to buy a table and 4 chairs?


When Bella buys 2 / 5 times more marbles, she'll have increased the number of marbles by 2 / 5 * 60 = 24. The total number of marbles she'll have is 60 + 24 = 84. If Bella currently has 60 marbles, and she has two times as many marbles as frisbees, she has 60 / 2 = 30 frisbees. If Bella buys 2 / 5 times more frisbees, she'll have 2 / 5 * 30 = 12 more frisbees. The total number of frisbees she'll have will increase to 30 + 12 = 42. Bella also has 20 more frisbees than deck cards, meaning she has 30 - 20 = 10 deck cards. If she buys 2 / 5 times more deck cards, she'll have 2 / 5 * 10 = 4 more deck cards. The total number of deck cards she'll have is 10 + 4 = 14. Together, Bella will have a total of 14 + 42 + 84 = 140 items.
The answer: 140
Reverse engineering the question: Bella has two times as many marbles as frisbees. She also has 20 more frisbees than deck cards. If she buys 2/5 times more of each item, what would be the total number of the items she will have if she currently has 60 marbles?


Reasoning and answer: The first one runs a mile in 7 minutes because 21 / 3 = 7. The second runs a mile in 8 minutes because 24 / 3 = 8. The first one would finish 5 miles in 35 minutes because 5 x 7 = 35. The second one would finish in 40 minutes because 5 x 8 = 40. It will take 75 minutes in total because 35 + 40 = 75.
The answer: 75
What was the question?
Question: Two friends are racing three miles. The first one runs it in 21 minutes. The second one runs it in 24 minutes. If they keep up the same pace, how long combined will it take for them to run 5 miles each?


Donna can finish a total of 8 x 5 = 40 episodes during the weekdays. Meanwhile, she can finish 8 x 3 = 24 episodes each day during the weekend. The total number of episodes she can watch every weekend is 24 x 2 = 48. Therefore, Donna can watch 40 + 48 = 88 episodes every week.
The answer: 88
Reverse engineering the question: Donna can watch 8 episodes each day during weekdays. On each weekend day, she can watch three times the number of episodes she can watch on the weekdays. How many episodes can she watch in a week?


Jeremy listened to 9 + 5 = 14 songs today. Thus, he listened to 9 + 14 = 23 songs in two days.
The answer: 23
Reverse engineering the question:
Jeremy listened to five fewer songs yesterday than today. Yesterday, he listened to nine songs. How many songs did Jeremy listen to in two days?