Reasoning and answer: The cost of the two laptops is 2 x $600 = $1200. The cost of the four smartphones is 4 x $400 = $1600. Thus, the total cost of all the items is $1200 + $1600 = $2800. Therefore, Celine gets a change of $3000 - $2800 = $200.
The answer: 200
What was the question?
Question: A shop sells laptops at $600 each and a smartphone at $400. Celine buys two laptops and four smartphones for her children. How much change does she get back if she has $3000?


Ludwig earns a total of $10 x 4 = $40 from Monday to Thursday. He earns $10 / 2 = $5 per day on Friday, Saturday, and Sunday. So, his total salary for Friday, Saturday, Sunday is $5 x 3 = $15. Therefore, his total weekly salary is $40 + $15 = $55.
The answer: 55
Reverse engineering the question: Ludwig works 7 days a week and he usually works half of the day during Friday, Saturday, and Sunday. If his daily salary is $10, how much does he earn every week?


Reasoning and answer: 40% of the class is boys because 100 - 60 = 40. There are 10 boys because 25x.4 = 10. 60% of the boys don't like playing basketball because 100 - 40 = 60. 6 boys don't like playing basketball because 10x.6 = 6. 12 girls like playing basketball because 6x2 = 12. There are 15 girls in the class because 25 - 10 = 15. 80% of the girls in class like playing basketball because 12 / 15 = .8.
The answer: 80
What was the question?
Question: June’s class has 25 students. 60% are girls and the rest are boys. 40% of the boys like playing basketball and the rest don't. The number of girls who like playing basketball is double the number of boys who don't like to. What percentage of the girls in the class like playing basketball?


Violet has 27 - 3 = 24 nails, twice the number of nails that Tickletoe has. Therefore, Tickletoe has 1 / 2 * 24 = 12 nails. Together, Tickletoe and Violet have 12 + 27 = 39 nails.
The answer: 39
Reverse engineering the question: Violet has 3 more than twice as many nails as Tickletoe. If Violet has 27 nails, how many nails do they have together?


Reasoning and answer: There are 60 minutes in an hour, so the trip took 1 1 / 2 * 60 = 90 minutes. Josie spent 3 + 13 + 14 + 18 = 48 minutes waiting. Thus, she spent 90 - 48 = 42 minutes shopping.
The answer: 42
What was the question?
Question: On a shopping trip in a crowded store, Josie had to wait 3 minutes for a cart, 13 minutes for an employee to unlock a cabinet to get her a product, 14 minutes for a stocker to restock a shelf with what she wanted, and 18 minutes in line to check out. Her shopping trip took an hour and a half. How many minutes did Josie spend shopping instead of waiting?


Reasoning and answer: 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
What was the question?
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?