Brain Teaser

Question In this game of Nim, Abdi and Suri are playing with one heap of 11 stones and another heap of 9 stones. The game is playe

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Question To celebrate the end of exams, three couples met for a dinner. They’re about to take seats at a round table for six

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Question This figure includes 20 line segments. Using these rules:   you can start at any intersection on the figure, you can

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Question Ada, Bella, Colette, and Delia are about to stand in a row, and Bella and Colette want to stand next to each other. What

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Question Clara left the house and realized that she forgot her keys. She asked her sister Daria to throw them from the balcony at

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Question You are trying to decide if you should play the following game:   You are given $5 for free. You keep flipping a fai

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Question Jerome has two empty containers: a 16-liter and an 18-liter container.   He needs to measure out exactly 10 liters i

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Question Matilda’s aquarium contains ten fish. For a science project, she randomly takes out one fish, marks it, and puts it

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Question The Minotaur is imprisoned at the center of a maze called the Labyrinth. To pass the time, he’s taken up a hobby: e

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Question You have two empty containers — one that holds 9 liters and the other that holds 11.25 liters.   Using these moves

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Question You have two containers — one that measures 75 milliliters and one that measures 90 milliliters.   You can do any

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Question What is the minimum number of colors required to fill the regions of this graph so that no two adjacent (sharing the same

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