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Welcome to perplexus.info, flooble's perplexing puzzle portal. Here, we collect all sorts of puzzles, from simple logic questions and word tricks to in-depth math problems like probability and geometry. Click around and see if your brain is up to the task! If you're new here, make sure you sign up so that you can leave comments and submit your own problems!
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Difficulty: 3 of 5 Random: Hexagon Hinder 2 (in Shapes) Rating: 4.00
The hexagon PQRSTU is such that:

(1) All its vertices lie on a circle, and:
(2) PQ = RS = TU, and:
(3) the diagonals PS, QT, RU meet at a point.

N is the intersection of PS and RT

Find:
 RN/NT
---------
(PR/RT)2
(No Solution Yet, 2 Comments) Submitted on 2016-05-06 by K Sengupta   
Difficulty: 3 of 5 Bonus: Up or down or... (in Science) Rating: 2.33
A jar filled partially with water has an object floating in it. The jar is open. Now, if the jar is closed and a vacuum pump is used to pump the air out, what will happen to the floating object? will it rise up more or sink or ...? and why?
(No Solution Yet, 20 Comments) Submitted on 2005-07-22 by nilshady   
Difficulty: 3 of 5Polynomial radicals (in Just Math)
Posted on 2021-05-14 by Danish Ahmed Khan (No Solution Yet, 0 Comments)
Difficulty: 3 of 5Positive divisor of positive divisor (in Numbers)
Posted on 2021-05-13 by Danish Ahmed Khan (No Solution Yet, 3 Comments)
Difficulty: 3 of 5Consecutive power sum (in Numbers)
Posted on 2021-05-12 by Danish Ahmed Khan (No Solution Yet, 1 Comments)
Difficulty: 3 of 5A Country, a City and a pamphlet (in Numbers)
Posted on 2021-05-11 by Ady TZIDON (No Solution Yet, 2 Comments)
Difficulty: 3 of 5Ones or twos II (in Numbers) Rating: 3.00
Posted on 2021-05-10 by Ady TZIDON (No Solution Yet, 1 Comments)
Difficulty: 3 of 5Five root function (in Just Math)
Posted on 2021-05-07 by Danish Ahmed Khan (No Solution Yet, 5 Comments)
Difficulty: 3 of 5Fibonacci Inequality (in Just Math) Rating: 4.00
Posted on 2021-05-06 by tomarken (No Solution Yet, 4 Comments)
Difficulty: 3 of 5Majority Opinion (in Paradoxes) Rating: 4.50
Posted on 2021-05-05 by tomarken (Solution Posted, 3 Comments)
Difficulty: 2 of 5Pandigital powers 2 (in Numbers) Rating: 4.50
Posted on 2021-05-04 by Math Man (No Solution Yet, 2 Comments)
Difficulty: 2 of 5Plus operator insertion (in Numbers) Rating: 3.00
Posted on 2021-05-03 by Danish Ahmed Khan (No Solution Yet, 1 Comments)
Difficulty: 3 of 5Locus amid two intersecting circles (in Geometry)
Posted on 2021-04-30 by Danish Ahmed Khan (No Solution Yet, 3 Comments)
Difficulty: 3 of 5Reverse and add in binary (in Numbers)
Posted on 2021-04-29 by Jer (No Solution Yet, 6 Comments)
Difficulty: 3 of 5Minimize parallelogram diagonal (in Geometry)
Posted on 2021-04-28 by Danish Ahmed Khan (No Solution Yet, 3 Comments)
Difficulty: 4 of 5The incompatible food triad (in General)
Posted on 2021-04-27 by Ady TZIDON (No Solution Yet, 4 Comments)
Difficulty: 1 of 5Chemical Sequence (in Science) Rating: 4.00
Posted on 2021-04-26 by Brian Smith (Solution Posted, 2 Comments)

Recently Posted Solutions:
Difficulty: 3 of 5Majority Opinion (in Paradoxes)
Submitted By tomarken. Solution posted on 2021-05-06 07:33:40
Difficulty: 1 of 5Chemical Sequence (in Science)
Submitted By Brian Smith. Solution posted on 2021-04-30 11:21:18
Difficulty: 3 of 5Bouncing Bishops (in General)
Submitted By Charlie. Solution posted on 2021-04-22 10:24:41
Difficulty: 3 of 5quadratic ^ quadratic (in General)
Submitted By Larry. Solution posted on 2021-04-06 18:17:40
Difficulty: 2 of 5Square Deal (in Word Problems)
Submitted By Charlie. Solution posted on 2021-04-01 10:25:06
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