Leila gave 2 * 25 = 50 toys. Mohamed’s donation was 3 * 19 = 57 toys. The difference is 57 - 50 = 7 toys. Mohamed therefore donated an additional 7 toys.
The answer: 7
Reverse engineering the question: Leila and Mohamed decided to donate their old toys to a children’s home. Leila gave 2 bags with 25 toys in each bag. Mohamed’s donation was 3 bags with 19 toys in each bag. How many more toys did Mohamed donate?


Reasoning and answer: Shirley completed 36 x 2 = 72 questions. The sum of Fiona and Shirley's questions is 36 + 72 = 108. Kiana completed 108 / 2 = 54 questions. In one hour, they completed 108 + 54 = 162 questions. In two hours, they completed 162 x 2 = 324 questions.
The answer: 324
What was the question?
Question: Fiona completed 36 math questions in an hour. Shirley was able to complete twice as many math questions within that same time, and Kiana completed half of the sum of Fiona and Shirley's math questions. If they each did the same number of questions the following hour, how many math questions did all three girls complete in 2 hours?


She needs to have a total of 4 * 85 = 340 points over the four tests. She has 80 + 70 + 90 = 240 points so far. She needs 340 - 240 = 100 on the fourth test.
The answer: 100
Reverse engineering the question: Maria's test scores are 80, 70, and 90. What score does she need to get on a fourth test so that her average score for the four tests is exactly 85?


Reasoning and answer: He bikes 20 * 2 = 40 miles each day for work. So he bikes 40 * 5 = 200 miles for work. That means he bikes a total of 200 + 200 = 400 miles for work. So he bikes a total of 400 / 25 = 16 hours.
The answer: 16
What was the question?
Question: Tim rides his bike back and forth to work for each of his 5 workdays. His work is 20 miles away. He also goes for a weekend bike ride of 200 miles.  If he can bike at 25 mph how much time does he spend biking a week?


A kilogram of chicken costs $6 - $2 = $4. Three kilograms of chicken cost $4 x 3 = $12. So, a 3 - kilogram of chicken and a kilogram of pork cost $12 + $6 = $18.
The answer: 18
Reverse engineering the question: A kilogram of pork costs $6 while a kilogram of chicken costs $2 less. How much will a 3-kilogram of chicken and a kilogram of pork cost?


The manuscript is 400 pages and the printers charge $0.05 per page for a total of 400 * .05 = $20.00 per manuscript. She needs 10 copies made and it costs $20.00 per manuscript so that's 10 * 20 = $200.00. She also needs each of the 10 copies to be bound, which is $5.00 per manuscript so that's 5 * 10 = $50.00. It will cost $200.00 to have them printed and $50.00 to have them bound for a total of 200 + 50 = $250.00.
The answer: 250
Reverse engineering the question:
Clarissa is responsible for getting 10 copies of a manuscript printed and having each copy bound. The printers charge $0.05 per page to copy it and $5.00 per manuscript to have it bound. If the manuscript is 400 pages, how much will it cost to have it copied and bound 10 times?