Reasoning and answer: First calculate how much the tax is by multiplying $15.00 by 20%: $15.00 * .2 = $3.00. Then subtract the cost of the meal and the tax from $20 to find Jason's tip: $20 - $15.00 - $3.00 = $2.00.
The answer: 2
What was the question?
Question: Jason waits on a customer whose check comes to $15.00. Jason's state applies a 20% tax to restaurant sales. If the customer gives Jason a $20 bill and tells him to keep the change, how much is Jason's tip?


Milena's grandmother is 7 * 9 = 63 years old. Her grandfather is 63 + 2 = 65 years old. So the age difference between Milena and her grandfather is 65 - 7 = 58 years.
The answer: 58
Reverse engineering the question: Milena is 7 years old, and her grandmother is 9 times older than her. Milena's grandfather is two years older than her grandmother. What is the age difference between Milena and her grandfather?


Reasoning and answer: Half of the price of the bicycle is 150 / 2 = $75. The money that Patrick has now is 75 – 50 = $25.
The answer: 25
What was the question?
Question: Patrick has been saving money to buy a bicycle that costs $150. He saved half the price but he then lent $50 to his friend. How much money does Patrick have now?


Mona joined 9 groups, so she played with 9 * 4 = 36 people. She grouped with 2 + 1 = 3 people twice. Thus, she played with 36 - 3 = 33 unique players that weekend.
The answer: 33
Reverse engineering the question: Mona plays a multiplayer video game on the weekends. She joins groups with four other players to complete objectives in the game. The past weekend, she joined 9 groups. One of the groups included two players she had grouped with before that weekend, and another group included one person she had grouped with before. How many unique players did Mona group with on the video game that weekend?


Reasoning and answer: The combined cost of the bananas, bread, and milk was 12 + 9 + 7 = $28. The difference between this and the total is the cost of the apples, which must have therefore cost Olivia 42 – 28 = $14.
The answer: 14
What was the question?
Question: The total cost of Olivia’s groceries was $42. The bananas cost her $12, the bread cost her $9, and the milk cost her $7. The only other groceries she bought were apples. In dollars, how much money did the apples cost her?


Reasoning and answer: Grace mowed lawns for 63 hours at $6 / hour, so earned 63 * 6 = $378. Grace pulled weeds for 9 hours at $11 / hour, so earned 9 * 11 = $99. Grace put down mulch for 10 hours at $9 / hour, so earned 10 * 9 = $90. During September Grace earned $378 + $99 + $90 = $567.
The answer: 567
What was the question?
Question:
Grace started her own landscaping business. She charges $6 an hour for mowing lawns, $11 for pulling weeds and $9 for putting down mulch. In September she mowed lawns for 63 hours, pulled weeds for 9 hours and put down mulch for 10 hours. How much money did she earn in September?