Let J = Josh's distance. 2J = Selena's distance. J + 2J = 36. 3J = 36 miles. J = 12. 2J = 24 miles. Selena ran 24 miles.
The answer: 24
Reverse engineering the question: Selena and Josh were running in a race. Together they ran 36 miles. Josh ran half of the distance that Selena ran. How many miles did Selena run?


Reasoning and answer: For the first 3 days, he pays 3 * $15 = $45. The next 2 days, he and his friends pay $45 * 2 = $90. Jimmy and his 2 friends pay $90 / 3 = $30 each. In total, Jimmy spent $45 + $30 = $75.
The answer: 75
What was the question?
Question: During vacation, Jimmy visits different beaches on an island, so he changes his place of lodging from time to time. The first 3 days he stays in a hostel, where he is charged $15 per night. The fourth and fifth days he stays in a cabin where he shares expenses with 2 of his friends, and they are charged $45 total per night. How much did Jimmy spend on lodging?


Last year, there were a total of 100 + 50 = 150 books in the library. The library purchased 50 x 3 = 150 books this year. Therefore, the library now has a total of 150 + 150 = 300 books.
The answer: 300
Reverse engineering the question: Last year, the school library purchased 50 new books. This year, it purchased 3 times as many books. If the library had 100 books before it purchased new books last year, how many books are in the library now?


Reasoning and answer: We have 2 kg = 2 * 1000 = 2000 g. So, the number of bars of chocolate is 2000 / 125 = 16.
The answer: 16
What was the question?
Question: A chocolate bar weighs 125 g. A shopkeeper has just received a 2 kilogram box of chocolate. How many bars does this represent?


The adult tickets cost $4.25 + $3.25 = $7.50. So two adult tickets cost $7.50 x 2 = $15. Four children's tickets cost $4.25 x 4 = $17. So the total cost of all the tickets amounted to $15 + $17 = $32. The family had a discount, so they paid a total of $32 - $2 = $30.
The answer: 30
Reverse engineering the question: Ashley and her family went to the movies on Saturday. Children’s tickets cost $4.25 and adult tickets cost $3.25 more. They were given a $2 discount for buying more than 3 tickets. How much did they spend if they bought two adult tickets and four children’s tickets?


Bran's scholarship pays $90 x 0.30 = $27 to his tuition fee. So, the total amount he still needs to pay is $90 - $27 = $63. And Bran will be able to earn $15 x 3 = $45 after working for 3 months. Therefore, the total amount he still needs to pay is $63 - $45 = $18.
The answer: 18
Reverse engineering the question:
Bran's tuition fee is $90. He does a part-time job that pays him $15 per month and he has a scholarship that takes care of 30% of his tuition fee. If he needs to pay his tuition fee within 3 months, how much does Bran still need to pay?