In the second anthill, there are 20 / 100 * 100 = 20 ants less. This means there are 100 - 20 = 80 ants in the second anthill. In the third anthill, there are 20 / 100 * 80 = 16 ants less compared to the second one. So in the third anthill, there are 80 - 16 = 64 ants.
The answer: 64
Reverse engineering the question: In a forest, there are three anthills. In the first anthill, there are 100 ants, and in each next anthill, there are 20% fewer ants than in the previous one. How many ants are in the third anthill?


Reasoning and answer: For the regular bikes, there are 7 x 2 = 14 wheels. For the children’s bikes, there are 11 x 4 = 44 wheels. Altogether, Naomi saw 14 + 44 = 58 wheels.
The answer: 58
What was the question?
Question: At the park, Naomi saw people riding 7 regular bikes and 11 children’s bikes. Regular bikes have 2 wheels and kid’s bikes have 4 wheels. How many wheels did Naomi see at the park?


The total cost for the vacation rentals will be $3200 + $800 = $4000. The cost per person will be $4000 / 8 = $500.
The answer: 500
Reverse engineering the question: Max is planning a vacation for 8 people. The Airbnb rental costs $3200. They also plan on renting a car that will cost $800. If they plan on splitting the costs equally, how much will each person’s share be?


Reasoning and answer: In the first week, the tree shed 2 / 5 * 1000 = 400 leaves. The number of leaves remaining on the tree at the end of the first week is 1000 - 400 = 600. In the second week, the tree shed 40 / 100 * 600 = 240 leaves. The number of leaves remaining on the tree is 600 - 240 = 360. The third week the tree shed 3 / 4 of its leaves, a total of 3 / 4 * 360 = 270 leaves. The number of leaves remaining on the tree is 360 - 270 = 90 leaves.
The answer: 90
What was the question?
Question: A tree had 1000 leaves before the onset of the dry season, when it sheds all its leaves. In the first week of the dry season, the tree shed 2/5 of the leaves. In the second week, it shed 40% of the remaining leaves. In the third week, the tree shed 3/4 times as many leaves as it shed on the second week. Calculate the number of leaves the tree hadn't shed by the third week.


Since Darryl has 20 books, Lamont, who has twice the number of books Darryl has, has 20 * 2 = 40 books. The total number of books both Darryl and Lamont has is 40 + 20 = 60 books. To have the same number of books as Lamont, Loris needs 3 more books, meaning she has 40 - 3 = 37 books. In total, the three has 60 + 37 = 97 books.
The answer: 97
Reverse engineering the question: Loris needs three more books to have the same number as Lamont, who has twice the number of books Darryl has. If Darryl has 20 books, calculate the total number of books the three have.


There are 2 dog walkers and they each have 2 legs so that's 2 * 2 = 4 legs. The other dog walker is walking 3 dogs that each have 4 legs so that's 3 * 4 = 12 legs. The dog walkers have 4 legs and the other dogs have 12 legs for a total of 4 + 12 = 16 legs. There are 36 legs total and 16 belong to the dog walkers and 3 dogs so that leaves 36 - 16 = 20 legs. Dogs have 4 legs and there are 20 legs so Mariel is walking 20 / 4 = 5 dogs.
The answer: 5
Reverse engineering the question:
Mariel is a dog walker. While walking her pack of dogs, she gets tangled up in the leashes of another dog walker and their 3 dogs. There are 36 legs tangled up in leashes. How many dogs is Mariel walking?