Nathalie ate 1 / 8 * 400g = 50g of cake. Pierre eats 2 * 50g = 100g of cake.
The answer: 100
Reverse engineering the question: A cake of 400 grams is divided into eight equal parts. Nathalie eats one-eighth of the cake, and Pierre eats double what Nathalie ate. How much did Pierre eat, in grams?


Reasoning and answer: If Marvin solved 40 math problems yesterday, he has solved 40 * 3 = 120 math problems today. The total number of math problems that Marvin has practiced is 120 + 40 = 160. Arvin has practiced twice as many as Marvin, so has practiced 160 * 2 = 320 problems. Together, Marvin and Arvin have solved 320 + 160 = 480 math problems.
The answer: 480
What was the question?
Question: The number of math problems that Marvin practiced today is three times as many as the number of problems he solved yesterday. His friend, Arvin, has practiced twice as many math problems on each day. How many math problems have they practiced altogether if Marvin solved 40 math problems yesterday?


On Monday, Kekai uses 40 * 6 = 240 m&ms. On Tuesday, Kekai uses 20 * 10 = 200 m&ms. Kekai uses a total of 240 + 200 = 440 m&ms. Kekai uses a 440 / 40 = 11 m&m packs.
The answer: 11
Reverse engineering the question: Kekai is running a sundae booth at the carnival. On Monday, he makes a total of 40 sundaes, and he puts 6 m&ms on each sundae. On Tuesday, he makes a total of 20 sundaes, and he puts 10 m&ms on each sundae. If each m&m pack contains 40 m&ms, how many m&m packs does Kekai use?


Reasoning and answer: The cypress trees will earn Gloria 20 trees * $100 / tree = $2000. From the sale of the cypress trees, Gloria will also make 600 trees * $200 / tree = $120000. Finally, the maple trees will bring in 24 trees * $300 / tree = $7200. Combining all the amounts will give Gloria a total of $150 + $2000 + $120000 + $7200 = $129350. Subtracting the cost of the mountain cabin from the total will leave Gloria with a balance of $129350 - $129000 = $350.
The answer: 350
What was the question?
Question: Gloria wants to buy the $129,000 mountain cabin that her friend Alfonso is selling. She only has $150 in cash. She intends to raise the remaining amount by selling her mature trees for lumber. She has 20 cypress trees, 600 pine trees, and 24 maple trees. She will get $100 for each cypress tree, $300 for a maple tree, and $200 per pine tree. After paying Alfonso for the cabin, how much money will Gloria have left?


The garden produced 237 potatoes - 60 = 177 cucumbers. The garden produced 177 cucumbers * 2 peppers / cucumber = 354 peppers. The garden produced 237 potatoes + 177 cucumbers + 354 peppers = 768 vegetables.
The answer: 768
Reverse engineering the question: A garden produced 237 potatoes, 60 fewer cucumbers and twice as many peppers than the cucumbers. How many vegetables did the garden produce?


Out of the 40 children taking part in the Halloween celebration, 80% were allowed to draw jelly beans from the bag, a total of 80 / 100 * 40 = 32 children. If each of the 32 children drew two jelly beans out of the bag, they drew a total of 32 * 2 = 64 jelly beans from the bag. The total number of jelly beans that remained is 100 - 64 = 36.
The answer: 36
Reverse engineering the question:
There were 100 jelly beans in a bag to be given away on Halloween. Out of the 40 children taking part in the Halloween celebration, 80% were allowed to draw jelly beans from the bag. Each child drew two jelly beans out of the bag. How many jelly beans remained in the bag after the children took their share?