Reasoning and answer: The chips cost $0.50 a bag and he buys them 5 days a week so that's .50 * 5 = $2.50 a week. If he spends $2.50 on chips a week then over 4 weeks he will spend 2.50 * 4 = $10.00 on chips.
The answer: 10
What was the question?
Question: Calvin buys a pack of chips, for $0.50, from the vending machine at lunch, 5 days a week. After 4 weeks, how much money has Calvin spent on chips?


In class A, there are 40 / 100 * 80 = 32 students. In class B, the number of students is less by 21, which means class B has 32 - 21 = 11 students. That means 80 - 32 - 11 = 37 students are in class C.
The answer: 37
Reverse engineering the question: Adam goes to a small school, which teaches 80 students in three classes. 40% of the students are in class A, and class B has 21 students fewer than class A. The rest are in class C. How many students are in this class?


Reasoning and answer: First, find the price of the sandwiches $5 per sandwich * 18 sandwiches = $90. Now add in the delivery fee $90 + $20 = $110. Now the tip $110 * 0.10 = $11. Add the tip to the price of the sandwiches $110 + $11 = $121 in total.
The answer: 121
What was the question?
Question: Preston has a sandwich shop. He charges $5 for each sandwich. He also charges $20 for a delivery fee. Abra Company orders 18 sandwiches from Preston and also tips him 10%. How much total, in dollars, did Preston receive?


Margaret has 100 * 0.75 = $0.75. Guy has $0.25 + $0.25 + $0.10 = $0.60. Bill has 6 * $0.10 = $0.60. Lance, Margaret, Guy and Bill have $0.70 + $0.75 + $0.60 + $0.60 = $2.65. Thus they have $2.65 * 100 = 265 cents.
The answer: 265
Reverse engineering the question: Lance has 70 cents, Margaret has three-fourths of a dollar, Guy has two quarters and a dime, and Bill has six dimes. How many cents do they have combined?


Reasoning and answer: He spend $1.5 on soda because 2 - .5 = 1.5. He bought 6 ounces of soda because 1.5 / .25 = 6.
The answer: 6
What was the question?
Question: Peter goes to the store to buy a soda. The soda costs $.25 an ounce. He brought $2 with him and leaves with $.50. How many ounces of soda did he buy?


Reasoning and answer: In the first year, Bobby will acquire 16 * .5 = 8 new cars. After the first year, he will have a total of 16 + 8 = 24 cars. In the second year, Bobby will acquire 24 * .5 = 12 new cars. After the second year, he will have 24 + 12 = 36 cars in total. In the third year, Bobby will acquire 36 * .5 = 18 new cars. After the third year, he will have 36 + 18 = 54 cars in total.
The answer: 54
What was the question?
Question:
Bobby has 16 toy cars, and the number of cars he has increases by 50% every year. How many toy cars will Bobby have in three years?