At the meeting, 200 - 100 = 100 people decided to have a snack. 20 new people came in to snack and the area had 100 + 20 = 120 of them eating. 120 / 2 = 60 people got full and left. 10 more new people came to join in the snacking so 60 + 10 = 70 people were eating. After 30 people left, 70 - 30 = 40 people who were eating remained. In the end, only 40 / 2 = 20 kept eating.
The answer: 20
Reverse engineering the question: A large gathering occurred at the town hall with 200 people participating. 100 people decided to have a snack, and then 20 new outsiders joined in to have a snack. Half of these snack eaters got full and left. 10 new outsiders came to have snacks, too. 30 more snack eaters got their fill and left. Then half of the remaining snack eaters left later on. How many snack eaters are left?
Reasoning and answer: The second movie was 2 * .5 = 1' hour longer than the first movie. So the second movie was 2 + 1 = 3 hours long. That means the first two movies had a combined time of 3 + 2 = 5 hours. So the last movie had a length of 5 - 1 = 4 hours. That means the marathon lasted 5 + 4 = 9 hours.
The answer: 9
What was the question?
Question: Tim decides to do a movie marathon. The first movie is 2 hours long. The next movie is 50% longer. And the last movie is 1 hour shorter than the combined time of the previous 2 movies. How long was his movie marathon?
After 3 hours, it will have 3 * 2 = 6 logs added to it. After 3 hours, it will have burned 3 * 3 = 9 logs. After 3 hours, the cookfire will have 6 + 6 - 9 = 3 logs left.
The answer: 3
Reverse engineering the question: A cookfire burns three logs every hour. It was built with six logs to start. If it gets two more logs added to it at the end of every hour, how many logs will be left after 3 hours?
Reasoning and answer: Heaven spent 2 * 5 = $10 on sharpeners. She also spent 4 * 5 = $20 on notebooks. Heaven's brother used 10 * 4 = $40 to buy erasers. The total amount of money Heaven and her sister spent on sharpeners, notebooks, and erasers is 40 + 20 + 10 = $70. The total amount of money her brother spent on highlighters is 100 - 70 = $30.
The answer: 30
What was the question?
Question: Heaven and her younger brother want to buy school supplies, so they ask their father for money, who gives them $100 in total to use. Heaven buys two sharpeners and four notebooks at $5 each, and her brother uses the remaining amount to buy ten erasers at $4 each and some highlighters. How much money did Heaven's brother spend on highlighters?
First find the cooked volume of the spinach: 40 ounces * 20% = 8 ounces. Then add that to the volume of the other ingredients to find the total volume: 8 ounces + 6 ounces + 4 ounces = 18 ounces.
The answer: 18
Reverse engineering the question: Mary is making a spinach quiche. She takes 40 ounces of raw spinach and cooks it until it's 20% of its initial volume. If she mixes the spinach with 6 ounces of cream cheese and 4 ounces of eggs, what is the total volume of the quiche?
The 3 - year - old dog ages 7 years to one human year so he will technically be 3 * 7 = 21 years old in dog years. Max's dog will be 21 when Max turns 3 so the age difference is 21 - 3 = 18.
The answer: 18
Reverse engineering the question:
For every 1 year a human ages, a dog ages 7 years. When Max is 3, how much older, in dog years, will his 3-year-old dog be?