There were 3 * 120 = 360 calories in the package. So he ate 360 / 2 = 180 calories.
The answer: 180
Reverse engineering the question: A package of candy has 3 servings with 120 calories each. John eats half the package. How many calories did he eat?
Reasoning and answer: He has 3 hours to read because 8 - 3.5 - 1.5 = 3. He has 180 minutes to read because 3 x 60 = 180. He can read 1,800 words because 180 x 10 = 1,800.
The answer: 1800
What was the question?
Question: Henri has 8 hours to watch movies and read. He watches one movie that is 3.5 hours and one movie that is 1.5 hours. He then decides to read. If he can read 10 words a minute, how many words does he read before his free time is up?
A small puzzle costs $23 - $15 = $8. Three small puzzles cost $8 x 3 = $24. So, 1 large and 3 small puzzles cost $24 + $15 = $39.
The answer: 39
Reverse engineering the question: A large puzzle costs $15. A small puzzle and a large puzzle together cost $23. How much would you pay for 1 large and 3 small puzzles?
Reasoning and answer: The length of the rectangle is 4 * 7 inches = 28 inches. The area of the rectangle is 7 inches * 28 inches = 196 square inches.
The answer: 196
What was the question?
Question: You draw a rectangle that is 7 inches wide. It is 4 times as long as it is wide. What is the area of the rectangle?
Half the cans collected by Martha is 90 / 2 = 45. So, Diego collected 45 + 10 = 55 cans. Martha and Diego collected 90 + 55 = 145 cans together. Thus, they need to collect 150 - 145 = 5 more cans.
The answer: 5
Reverse engineering the question: Martha collected 90 cans while Diego collected 10 more than half the cans collected by Martha. If both of them should collect a total of 150 cans for their project, how many more cans do they need to collect?
He got 20 - 8 = 12 gifts on his 13th birthday. So he got 20 + 12 = 32 total gifts.
The answer: 32
Reverse engineering the question:
John received 20 gifts on his 12th birthday. He received 8 fewer gifts on his 13th birthday. How many total gifts did he receive between those two birthdays?