Brain Teaser

Question One of the three instructions below is a repetition of another. Given positive numbers A and B, you can rearrange all thr

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Question Daisy, Evie, Faye, Gwen, and Harry are comparing the numbers of students in their classes. These statements are all true:

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Question Geoff and Tetsu are playing a game in which they take turns removing cards from a deck of 16 cards. These are the rules:

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Question The top two scales shown are balances. How many circles will balance one triangle and one square? 3 4 5 6

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Question All of the ornaments hanging from this mobile have the same mass. Is the mobile balanced? Yes No It isn’t possible to d

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Question Two ants sit at the base of a cylindrical can with height 6 cm and circumference 16 cm. They want to get to the point at

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Question In this circle, a few angles are formed by two diameters and one additional radius. Which angle is larger, blue or yellow

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Question Two friends start playing a game with a token in the bottom-left corner of the grid. The game ends when the token reaches

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Question Pictured are a regular hexagon and the same hexagon stellated into a star. If the area of the hexagon is A, what is the a

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Question Dashed arrows mean to add. If each of the seven circles contains a unique non-negative integer, how many values can the m

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Question The lower base of this trapezoid is three times as long as its upper base. The area of the yellow triangle equals 45. Wha

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Question In the pictured triangles, the angle measures are as follows:   ∠BAC=y−12° ∠ADB=x+64° ∠ABD=y+10° ∠BDC=x

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