Reasoning and answer: There are 50 * 30 / 100 = 15 boys at that party. That means there are 50 - 15 = 35 girls.
The answer: 35
What was the question?
Question: At a party, there are 50 people. 30% of them are boys. How many girls are at this party?


His speed means he can do 10 / 100 = .1 minute per piece. So he can finish 1 puzzle in 2000 * .1 = 200 minutes. So these two puzzles take 200 * 2 = 400 minutes.
The answer: 400
Reverse engineering the question: James buys 2 puzzles that are 2000 pieces each. He anticipates for these larger puzzles he can do 100 pieces every 10 minutes. So how long would it take to finish both puzzles?


Reasoning and answer: The total number of flyers Belinda’s friends passed out was 42 by Ryan + 67 by Alyssa + 51 by Scott = 160 flyers. Belinda passed out 200 total flyers – 160 flyers passed out by friends = 40 flyers. To express this as a decimal, divide Belinda’s 40 flyers / 200 total flyers = 0.20. Belinda passed out 0.20 x 100% = 20% of the flyers.
The answer: 20
What was the question?
Question: Belinda’s dog is missing, so she made 200 flyers to distribute around town with the help of her friends. Ryan passed out 42 flyers, Alyssa passed out 67, Scott passed out 51 and Belinda passed out the rest. What percentage of the flyers did Belinda pass out?


In four years, Hans will be 8 + 4 = 12 years old. Then Annika will be 12 * 3 = 36 years old. So Annika right now is 36 - 4 = 32 years old.
The answer: 32
Reverse engineering the question: In four years, Annika will be three times as old as Hans. If Hans is now 8 years old, how old is Annika now?


Reasoning and answer: Two dozens of pencils are equal to 2 x 12 = 24 pencils. So the total cost of pencils is $0.5 x 24 = $12. The total cost of folders is $0.9 x 20 = $18. Thus, the cost to buy the office supplies is $12 + $18 = $30.
The answer: 30
What was the question?
Question: A pencil costs $0.5 each and a folder costs $0.9 each. An office needs two dozen pencils and 20 pieces of folders. How much does it cost to buy the office supplies?


Reasoning and answer: After this week, Michelangelo will have 28 - 12 = 16 more ceilings to paint. Next week, Michelangelo will paint 12 / 4 = 3 ceilings. Michelangelo will have 16 - 3 = 13 more ceilings to paint.
The answer: 13
What was the question?
Question:
Michelangelo has 28 ceilings to paint. This week, he paints 12 of them. Next week, he will paint 1/4 the number of ceilings he did this week. How many ceilings will be left to paint after next week?