Both Polly and Peter played 30 / 2 = 15 moves each one. With an average of 28 seconds per move, Polly's moves lasted a total of 15 * 28 = 420 seconds. With an average of 40 seconds per move, Peter's moves lasted a total of 15 * 40 = 600 seconds. In total, the match lasted 420 + 600 = 1020 seconds. In minutes, the match lasted 1020 / 60 = 17 minutes.
The answer: 17
Reverse engineering the question: Polly and Peter play chess. Polly takes an average of 28 seconds per move, while Peter takes an average of 40 seconds per move. The match ends after 30 moves. How many minutes did the match last?
Reasoning and answer: Barbi = 1.5 * 12 months = 18 kg. Luca = 9 * 11 = 99 kg. 99 - 18 = 81 kg. Luca lost 81 kg more than Barbi.
The answer: 81
What was the question?
Question: Barbi lost 1.5 kilograms each month for a year. Luca lost 9 kilograms every year for 11 years. How many more kilograms did Luca lose than Barbi?
On Tuesday Buddy has 30 / 2 = 15 baseball cards. On Wednesday Buddy has 15 + 12 = 27 baseball cards. On Thursday Buddy buys 15 / 3 = 5 baseball cards. On Thursday Buddy has a total of 27 + 5 = 32 baseball cards.
The answer: 32
Reverse engineering the question: On Monday Buddy has 30 baseball cards. On Tuesday Buddy loses half of them. On Wednesday Buddy buys 12 baseball cards. On Thursday he buys a third of what he had on Tuesday. How many baseball cards does he have on Thursday?
Reasoning and answer: Let x be the price of the chair. The table costs 3 * x. The couch costs 3 * x * 5 = 15 * x. x + 3 * x + 15 * x = 380. 19 * x = 380. x = 20. The couch costs 20 * 15 = 300 dollars.
The answer: 300
What was the question?
Question: John buys a chair. He then buys a table that is 3 times the price of the chair. Then, he buys a couch that is 5 times the price of the table. If John paid $380 for all these items, what is the price of the couch?
One - third of the classrooms have 30 desks, so there are 1 / 3 * 15 = 5 classrooms like that. The rest, which means 15 - 5 = 10 classrooms, have 25 desks. One - third of the classrooms can fit 5 * 30 = 150 students. The rest can fit 10 * 25 = 250 students. So in total, the school can be filled with 150 + 250 = 400 students.
The answer: 400
Reverse engineering the question: A school has 15 classrooms. One-third of these classrooms have 30 desks in each classroom and the rest have 25 desks in each classroom. Only one student can sit at one desk. How many students can this school accommodate so that everyone has their own desk?
The number of guests that bring a plus one is 30 / 2 = 15 guests. The total number of guests at the party, including the plus ones, is 30 + 15 = 45 guests. Since there are 3 courses, Wickham will need 45 * 3 = 135 plates.
The answer: 135
Reverse engineering the question:
Wickham is throwing a huge Christmas party. He invites 30 people. Everyone attends the party, and half of the guests bring a plus one (one other person). He plans to serve a 3-course meal for the guests. If he uses a new plate for every course, how many plates does he need in total for his guests?