Jonah started with 14 fish + 2 more = 16 fish. Of the 16 fish – 6 were eaten – 2 were returned to the store = 8 fish. After he returned the fish to the store, he exchanged them for 3 new fish + 8 fish that were left = 11 fish now in his tank.
The answer: 11
Reverse engineering the question: Jonah decided to set up an aquarium. He started with 14 small fish. He added 2 more, but they ate 6 of his original fish before he could remove them and take them back to the store. He exchanged them for 3 new fish. How many fish does Jonah have now?


Reasoning and answer: Since the number of oranges that Martin has now is twice the number of limes, there are 50 / 2 = 25 limes. The number of fruits she has now is 50 oranges + 25 limes = 75. If she had eaten half of the number of fruits that she had, initially Martin had 2 * 75 = 150 fruits.
The answer: 150
What was the question?
Question: After eating half of the number of fruits he had, Martin remained with twice as many oranges as limes. If he has 50 oranges now, how many fruits did he initially have?


The total marks of science and music are 70 + 80 = 150. When you add the marks she scored in social studies, the full marks become 150 + 85 = 235. She scored half as many marks in physics as she scored music, totaling 1 / 2 * 80 = 40 marks. When you add the marks she scored in physics to the total marks of the other subjects, the full marks become 235 + 40 = 275.
The answer: 275
Reverse engineering the question: Teresa scored 70 marks in science, 80 in music, 85 in social studies, and the physics exam, which was the hardest test that Teresa had ever taken in her entire life, she scored half as many marks as she scored in music. Calculate the total marks Teresa scored in all the subjects.


Reasoning and answer: Let A be Matthew’s age. Rebecca is A - 2 years old. Freddy is A + 4 years old. Their ages add up to 35, so A + A - 2 + A + 4 = 3A + 2 = 35. Therefore, 3A = 35 - 2 = 33. Matthew is A = 33 / 3 = 11 years old. Thus, Freddy is 11 + 4 = 15 years old.
The answer: 15
What was the question?
Question: Cynthia has three children whose ages add up to 35. Matthew is two years older than Rebecca and four years younger than Freddy. How many years old is Freddy?


Bob got 12 * 10 = 120 skips. Jim got 15 * 10 = 150 skips. So in total they got 120 + 150 = 270 skips.
The answer: 270
Reverse engineering the question: Bob and Jim decide to skip rocks. Bob can skip a rock 12 times. Jim can skip a rock 15 times. If they each skipped 10 rocks how many total skips did they get?


If the price of a lawnmower was $1800 a year ago, 2 / 5 less than the cost right now, then it now costs 2 / 5 * 1800 = $720 more to buy one lawnmower. The total cost of buying one lawnmower right now is $1800 + $720 = $2520. To purchase 4 such lawnmowers, Mr. Lucian will have to pay $2520 * 4 = $10080.
The answer: 10080
Reverse engineering the question:
A year ago, the total cost of buying a lawnmower was 2/5 times less than the cost it goes for now. If the cost was $1800 a year ago, calculate how much it would cost Mr. Lucian to buy 4 such lawnmowers.