Three candy bars cost ¢25 x 3 = ¢75. Two pieces of chocolate cost ¢75 x 2 = ¢150. So, the total amount needed to buy those is ¢75 + ¢150 + ¢50 = ¢275. Since a quarter is equal to ¢25, therefore ¢275 / ¢25 = 11 quarters are needed.
The answer: 11
Reverse engineering the question: A snack machine accepts only quarters. Candy bars cost ¢25, each piece of chocolate costs ¢75, and a pack of juice costs ¢50. How many quarters are needed to buy three candy bars, two pieces of chocolate, and one pack of juice?


Reasoning and answer: Susan spent 600 / 2 = 300 on clothes. After buying clothes she had 600 - 300 = 300 dollars left. She spent 300 / 2 = 150 dollars on books. She had 300 - 150 = 150 dollars left.
The answer: 150
What was the question?
Question: Susan earned $600 from babysitting over the summer. She went shopping and spent half of it on clothes. Then she spent half of what was left on books. How much money did she have left?


The amount before the deduction is $430 + $190 = $620. The amount paid to the seller after the discount is $620 - $100 = $520.
The answer: 520
Reverse engineering the question: Michael buys his suit for $430 and shoes for $190. So, if he gets a $100 discount, what was the amount that he paid to the seller?


Reasoning and answer: Roseville city has 3 * 2000 - 500 = 5500 people. Sun City has 2 * 5500 + 1000 = 12000 people.
The answer: 12000
What was the question?
Question: Sun City has 1000 more than twice as many people as Roseville City. Roseville city has 500 less than thrice as many people as Willowdale city. If Willowdale city has 2000 people, how many people live in Sun City?


So far, Jenny has spent 10 + 2 = 12 hours on the project. Thus, she has 20 - 12 = 8 hours to write her report.
The answer: 8
Reverse engineering the question: Jenny is working on a school project. She spends 10 hours doing research for the project and 2 hours writing a proposal. If she has 20 hours total to work on the project, how many hours does she have left to write her report?


Two pairs of sunglasses costs 2 x $50 = $100. So, Mary spent $100 + $100 = $200. Thus, two decks of basketball cards costs $200 - $150 = $50. Therefore, one deck of basketball cards costs $50 / 2 = $25.
The answer: 25
Reverse engineering the question:
Mary and Rose went shopping to buy presents. They spent the same amount. Mary bought two pairs of sunglasses for $50 each and a pair of jeans for $100. Rose bought a pair of shoes at $150 and two decks of basketball cards. How much did one deck of basketball cards cost?