He watched for 120 minutes because 2 x 60 = 120. This means 12 blocks of chores must be done because 120 / 10 = 12. He has to do 96 minutes of chores because 12 x 8 = 96.
The answer: 96
Reverse engineering the question: Every Sunday John is allowed to watch cartoons. However, for every 10 minutes of cartoons, he has to do 8 minutes of chores. If he watches cartoons for 2 hours, how many minutes of chores does he have to do?


Reasoning and answer: Combining the tennis and soccer balls, there are 15 + 5 = 20 balls in each basket. There are 5 baskets, hence 5 * 20 = 100 balls in total. 3 students removed 8 balls each, they removed 3 * 8 = 24 balls. From the total number of balls, they left 100 - 24 = 76 balls. There are 56 balls left so the other 2 students must have removed a total of 76 - 56 = 20 balls. This means that each of these 2 students removed 20 / 2 = 10 balls.
The answer: 10
What was the question?
Question: A coach placed 15 tennis balls and 5 soccer balls each into 5 baskets. He gave 5 of his students a short period of time to remove as many balls each from a basket as they could. 3 of them removed 8 balls each and the other 2 removed a certain number of balls each. If a total of 56 balls are still in the baskets, how many balls did the other 2 students each remove?


Ember is 14 / 2 = 7 years old. When she is 14, Nate will be 14 + 7 = 21 years old.
The answer: 21
Reverse engineering the question: Ember is half as old as Nate who is 14. When she is 14 herself, how old will Nate be?


Reasoning and answer: If the bus takes 40 minutes to complete 80 miles of a trip, Amanda's car, which takes five fewer minutes to complete a trip than the bus, will take 40 - 5 = 35 minutes to complete the trip. A round trip will take the car twice the time for going one way, a total of 35 + 35 = 70.
The answer: 70
What was the question?
Question: Amanda's car takes five fewer minutes to complete the same trip to the beach than the bus. If the bus takes 40 minutes to drive 80 miles to the beach, how many minutes will it take the car to make a round trip?


Hugh and Tommy have a total of 8 + 6 = 14 candies. Since Melany also has seven candies, they have 14 + 7 = 21 candies. If they combine and share the candies equally, each person will get 21 / 3 = 7 candies.
The answer: 7
Reverse engineering the question: Hugh had eight pounds of candy, Tommy had six pounds of candy, and Melany had seven pounds of candy. If they share the candy equally, how much will each person have?


If each bulb uses 60 watts each day, the 40 bulbs that Allyn has uses 60 * 40 = 2400 watts of power each day. In June, with 30 days, the bulbs will use 30 * 2400 = 72000 watts of power. If Allyn is charged an electricity bill of twenty cents per power watt used, in June she will pay 72000 * $0.20 = $14400.
The answer: 14400
Reverse engineering the question:
A sixty bulb watt uses 60 watts of power each day. If Allyn has 40 such bulbs in his house and pays an electricity bill of twenty cents per power watt used, calculate Allyn's total monthly expenses on electricity in June.