Brain Teaser

What time is it?

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All four Kings from a deck of cards are placed face down on a table in a random order. You select two of them, and if both are the

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How many quadrilaterals are drawn in this figure? Hint: Be sure to count both convex and concave quadrilaterals.

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A light ray emitted from a vertex of this isosceles triangle reflects 6 times before reaching another vertex. What is the total

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Place the ten integers 2 through 11 into the ten squares such that the sum of the numbers in each 2x2 square is the same value, P.

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Regular hexagon patio blocks of area 1 are used to outline the garden shown, with n=5 blocks on each side placed edge to edge.

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An ant named Honey is kept outside a solid cube on a leash, which extends to twice the side length of the cube. The leash can b

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What's the minimum number of straight cuts required to cut a circle into 7 regions of equal area? There are a number of ways t

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The area of the whole rectangle is 160 and the area in red is 12. What is the area in green?

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Seven identical regular hexagons are arranged in a honeycomb pattern. If each hexagon has area 8, what is the area of the red tria

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Magnus, Garry, and Fabiano are playing in a badminton event. In this event, after two players face off for a set, the winner stays

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