Brain Teaser

Question We have two sequences: n! : 1, 2, 6, 24,… 10n : 10, 100, 1000,… Select all the values of n that make n! larger than 1

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Question There’s a 1×6 rectangular hole in the middle of a 7×10 rectangle. Is it possible to cut the blue rectangle with a

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Question Sulfuric acid (H2SO4) is produced from sulfur in a multi-step process, but the ultimate result is expressed in the balanc

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Question If a tan snowflake has area T and a dark-green snowflake has area G, what is T/G? 2 3 4 5 Like these puzzles? For a limit

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Question In the gear system shown, a set of silver gears is introduced that each have 20 teeth. Suppose the silver gear on the lef

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Question What is the side length of the outer regular pentagon? 3 1+3x 2+2x 2+3x Like these puzzles? Like these puzzles? For a lim

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Question What is the length of this infinitely-zig-zagging red line? 12 feet 15 feet 18 feet 30 feet It’s either infinite or und

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Question Every letter corresponds to a different digit and 0 cannot be the first digit of a number. What is the sum of C+A+R? 12 1

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Question A jar contains 8 cards numbered 1 through 8.You need a pair of them that sum to 9 but, unfortunately, you have to select

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Question How many triangles would balance three circles? 1 2 3 4 Like these puzzles? For a limited time, MIT alumni and friends ca

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Question Every angle in the figure is a right angle, and the colored rectangle has an area of 48. What is x? 10 10.5 11 11.5 Like

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Question You and three friends are sitting in a circle. Each of you holds in your hand 2 beans, each of which magically doubles ac

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