Reasoning and answer: The second level has 90 + 8 = 98 parking spaces. The third level has 98 + 12 = 110 parking spaces. The fourth level has 110 - 9 = 101 parking spaces. So the parking garage can accommodate 90 + 98 + 110 + 101 = 399 cars. Thus, the parking garage can still accommodate 399 - 100 = 299 cars.
The answer: 299
What was the question?
Question: A parking garage of a mall is four stories tall. On the first level, there are 90 parking spaces. The second level has 8 more parking spaces than on the first level, and there are 12 more available parking spaces on the third level than on the second level. The fourth level has 9 fewer parking spaces than the third level. If 100 cars are already parked, how many cars can be accommodated by the parking garage?


The population increased by 100000 * .6 = 60,000 from births. They lost 2000 * 10 = 20,000 people from emigration. They gained 2500 * 10 = 25,000 people from immigration. That means the net increase from people moving was 25000 - 20000 = 5,000. So the total population is 100,000 + 60,000 + 5,000 = 165,000.
The answer: 165000
Reverse engineering the question: The population of an area starts at 100,000 people. It increases by 60% over 10 years due to birth. In that same time, 2000 people leave per year from emigration and 2500 people come in per year from immigration. How many people are in the area at the end of 10 years?


Reasoning and answer: Marie has 4 x 20 = 80 stamps from her notebooks. And she has 2 x 50 = 100 stamps from her binders. So she has a total of 80 + 100 = 180 stamps. Marie decided to keep 180 x 1 / 4 = 45 stamps only. Therefore, she can give away 180 - 45 = 135 stamps.
The answer: 135
What was the question?
Question: Marie has 4 notebooks with 20 stamps each. She also has two binders with 50 stamps each. If she decides to only keep 1/4 of the stamps, how many stamps can she give away?


He bought 10 + 5 = 15 meters of plastic pipe. The total meters of the copper and plastic pipe is 10 + 15 = 25. The plumber spent $4 x 25 = $100 on copper and plastic pipe.
The answer: 100
Reverse engineering the question: A plumber bought 10 meters of copper and 5 more meters of plastic pipe. If each meter cost $4, how much did the plumber spent on the copper and plastic pipe?


Reasoning and answer: Nate had read 400 x 20 / 100 = 80 pages. So, he still needs to read 400 - 80 = 320 pages to finish the book.
The answer: 320
What was the question?
Question: Nate is reading a 400-page book. He finished reading 20% of the book. How many pages does he need to read to finish the book?


Reasoning and answer: Going by the ratio, for every 1 part that Amy gets, Sandra will get 2 parts. Since Amy got $50, Sandra will get 2 * $50 = $100.
The answer: 100
What was the question?
Question:
Sam shared a sum of money between his three cousins Sandra, Amy and Ruth in the ratio 2:1:3 respectively. If Amy got $50, how much did Sandra get?