X is a Y
Logic puzzles require you to think. You will have to be logical in your reasoning.
An X is a Y, but a Y is not an X.
Replace X and Y with words to make the sentence make sense.
HintThink out of the BOX
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Answer
a SQUARE is a RECTANGLE, but a RECTANGLE is not a SQUARE.
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Comments
maneesh
Dec 02, 2001
 That way there could be many solutions..
1.A rhombus is a quadrilateral but a quadrilateral is not a rhombus
Similarly many pairs like
Square  Quadrilateral
Rectangle  Quadrilateral
Isoscles TriangleTriangle
Equilateral TriangleTriangle
Right TriangleTriangle
..and lot more

gilmoregirlsfan
Jun 09, 2005
 I learned ALL of thoose in the fifth grade! 
paul726
Mar 05, 2006
 Also, a square is a rectangle, but a rectangle is not NECESSARILY a square. That is, it can be one. 
stil
Apr 29, 2006
 Wrong category. Geometry can involve computation, but all I see in this teaser is definition. 
tonjawithaj
Sep 05, 2006
 Good one, but I agree that there are MANY answers to this. 
lessthanjake789
Sep 14, 2006
 math isnt even necessary. along the same lines of Y is not necessarily X  a spoon is a utensil but a utensil is not (necessarily) a spoon. or any inclusive thing to a larger group. the list goes on and on. 
7mi27
Jul 01, 2008
 I agree, the question wasn't phrased very well... 
efurosibina
Jun 29, 2011
 the teaser was not phrased properly.anything could stand for X and Y. 
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