Reasoning and answer: The bags together weigh 16 + 30 = 46 kg. Removing the 4 kg, the bags will weigh 46 - 4 = 42 kg.
The answer: 42
What was the question?
Question: A bag full of sugar weighs 16 kg. A bag full of salt weighs 30 kg. If you remove 4 kg from the combined weight of these two bags, how much do the bags now weigh?


First convert the length of the mural to inches: 15 feet * 12 inches / foot = 180 inches. Then convert the height of the mural to inches: 10 feet * 12 inches / foot = 120 inches. Then multiply the length and the height to find the total area of the mural: 180 inches * 120 inches = 21600 square inches. Since each tile is 1 square inch, this is also the number of tiles she needs.
The answer: 21600
Reverse engineering the question: Mary is building a mosaic for her school cafeteria's wall. It will be 10 feet tall and 15 feet long. Each tile she uses is 1 inch square. How many tiles will she need?


Reasoning and answer: 15 keyboards at $20 per keyboard cost a total of 15 * $20 = $300. The total cost of printers and keyboards is $2050 so 25 printers cost $2050 - $300 = $1750. 1 printer cost $1750 / 25 = $70.
The answer: 70
What was the question?
Question: A merchant bought 15 keyboards and 25 printers for a total of $2050. If a keyboard costs $20, how much does a printer cost?


In a week, Elliot will read 20 x 7 = 140 pages. Adding the prior readings, he has read a total of 149 + 140 = 289 pages. There are 381 - 289 = 92 pages still left to be read.
The answer: 92
Reverse engineering the question: There are 381 pages in Elliot’s book. He has already read 149 pages. If he reads 20 pages a day for a week, how many pages are still left to be read?


Reasoning and answer: Mom bought things that cost: 4 + 4 + 2 + 6 + 11 = €27 . So she has 55 – 27 = €28 left.
The answer: 28
What was the question?
Question: Mom went shopping at the market. She left with €55. She bought 2 packs of bananas for €4 each, pears for €2, asparagus for €6 and finally a chicken for €11. How much money does Mom have left?


Reasoning and answer: It takes 10 minutes to wash 4 windows and he has 64 windows so that breaks down to 64 / 4 = 16 units. It takes 10 minutes to wash a unit of windows and he has 16 units so 10 * 16 = 160 minutes.
The answer: 160
What was the question?
Question:
It takes David 10 minutes to wash 4 windows. David's house has 64 windows. How many minutes will it take David to wash all of the windows?