Martha spent 6 / 2 = 3 dollars. Martha and Doris spent 6 + 3 = 9 dollars. There were 21 - 9 = 12 dollars left in the cookie jar.
The answer: 12
Reverse engineering the question: There were 21 dollars in the cookie jar. Doris spent $6 from the cookie jar. Martha spent half as much as Doris. How much money, in dollars, was left in the cookie jar?


Reasoning and answer: Maria has 4 + 5 = 9 quarters. The number of dollars from the quarters is 9 * $0.25 = $2.25. The number of dollars from the dimes is 4 * $0.10 = $0.40. The number of dollars from the nickels is 7 * $0.05 = $0.35. The total number of dollars is $2.25 + $0.40 + $0.35 = $3.
The answer: 3
What was the question?
Question: Maria has 4 dimes, 4 quarters, and 7 nickels in her piggy bank. Her mom gives her 5 quarters. How much money, in dollars, does Maria have now?


Chad uses 2 crackers for each "sandwich" and has 5 sandwiches a night so he eats 2 * 5 = 10 crackers a night. The box has 4 sleeves of crackers and each sleeve has 28 crackers for a total of 4 * 28 = 112 crackers. 1 box has 112 crackers so 5 boxes will have 112 * 5 = 560 crackers. He eats 10 crackers a night and 5 boxes have 560 crackers so they will last him 560 / / 10 = 56 nights.
The answer: 56
Reverse engineering the question: Chad sandwiches 2 crackers with a scoop of peanut butter. He has 5 of these crackers a night before bed. A box of crackers has 4 sleeves with each sleeve holding 28 crackers. How many nights will 5 boxes of crackers last him?


Reasoning and answer: Maria has 3 x 2 = 6 free flowers from buying 3 dozens flowers. Since each dozen is equal to 12, then Maria bought 3 x 12 = 36 flowers. Hence, she has a total of 36 + 6 = 42 flowers.
The answer: 42
What was the question?
Question: For every one dozen flowers bought, a customer gets 2 free flowers. If Maria wants to buy 3 dozens flowers, how many pieces of flowers will she have in all?


Each breakfast plate has 2 x 2 = 4 bacon strips. The cook needs to fry 14 x 4 = 56 bacon strips.
The answer: 56
Reverse engineering the question: At a cafe, the breakfast plate has two eggs and twice as many bacon strips as eggs. If 14 customers order breakfast plates, how many bacon strips does the cook need to fry?


Benny spent 2 * $4 = $8 on soft drinks. Benny spent a total of $28 - $8 on soft drinks = $20 on candy bars. Benny spent $20 / 5 candy bars = $4 for each candy bar.
The answer: 4
Reverse engineering the question:
Benny bought 2 soft drinks for$ 4 each and 5 candy bars. He spent a total of 28 dollars. How much did each candy bar cost?