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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!
> Logic> Probability> Shapes> General (2)
> Numbers> Games> Paradoxes> Riddles (1)
> Just Math (2)> Science> Algorithms
For how many ordered pairs (x,y,z) of positive integers with x < y < z is the harmonic mean of x, y and z equal to 1220?

(No Solution Yet, 1 Comments) Submitted on 2014-11-22 by K Sengupta   
Difficulty: 4 of 5 Bonus: Unknown Digits (in Numbers) Rating: 3.67
In this cryptarithm, each letter above the line represents a digit differing by 1 from the digit represented by the same letter below the line. For example, if A=3 above the line, then A=2 or A=4 below the line. All occurrences of a letter on the same side of a line represent the same digit. It is also known that there are total of five digits in the solution.
 ADABA
+CACBA
------
 DBABC
(Solution Posted, 8 Comments) Submitted on 2004-08-11 by Brian Smith   
Difficulty: 3 of 5Two cities + (in Cryptography)
Posted on 2014-11-21 by Ady TZIDON (No Solution Yet, 2 Comments)
Difficulty: 3 of 5To a fifth of the wind, that pierces us most (in Famous Riddles)
Posted on 2014-11-21 by K Sengupta (No Solution Yet, 1 Comments)
Difficulty: 3 of 5Phrase Order Ponder (in Word Problems)
Posted on 2014-11-20 by K Sengupta (No Solution Yet, 2 Comments)
Difficulty: 3 of 5Minimum Value Muse 2 (in Just Math)
Posted on 2014-11-20 by K Sengupta (No Solution Yet, 2 Comments)
Difficulty: 3 of 5Simultaneous Satisfaction II (in Just Math) Rating: 3.00
Posted on 2014-11-19 by K Sengupta (No Solution Yet, 1 Comments)
Difficulty: 3 of 5A symmetric relation (in Just Math)
Posted on 2014-11-19 by Ady TZIDON (No Solution Yet, 5 Comments)
Difficulty: 3 of 5Real Resolution II (in Just Math)
Posted on 2014-11-18 by K Sengupta (No Solution Yet, 1 Comments)
Difficulty: 2 of 5Just a tiny addition (in Just Math)
Posted on 2014-11-18 by Ady TZIDON (Solution Posted, 5 Comments)
Difficulty: 3 of 5Missions impossible (in Just Math)
Posted on 2014-11-17 by Ady TZIDON (No Solution Yet, 1 Comments)
Difficulty: 3 of 5Well said (in General)
Posted on 2014-11-17 by Ady TZIDON (No Solution Yet, 2 Comments)
Difficulty: 3 of 5Inconsiderable Integer Illation (in Just Math) Rating: 5.00
Posted on 2014-11-16 by K Sengupta (No Solution Yet, 10 Comments)
Difficulty: 4 of 5Diophantine Doldrum (in Just Math)
Posted on 2014-11-15 by K Sengupta (No Solution Yet, 2 Comments)
Difficulty: 3 of 5An aSCending SCale (in Word Problems)
Posted on 2014-11-14 by Ady TZIDON (Solution Posted, 5 Comments)
Difficulty: 2 of 5My numbers (in Numbers) Rating: 3.00
Posted on 2014-11-14 by Ady TZIDON (Solution Posted, 3 Comments)

Recently Posted Solutions:
Difficulty: 2 of 5Just a tiny addition (in Just Math)
Submitted By Ady TZIDON. Solution posted on 2014-11-22 07:21:09
Difficulty: 3 of 5An aSCending SCale (in Word Problems)
Submitted By Ady TZIDON. Solution posted on 2014-11-22 07:19:47
Difficulty: 2 of 5My numbers (in Numbers)
Submitted By Ady TZIDON. Solution posted on 2014-11-20 14:21:40
Difficulty: 3 of 5Win some, lose some (in Logic)
Submitted By Ady TZIDON. Solution posted on 2014-11-10 21:31:20
Difficulty: 2 of 5Fridays (in Numbers)
Submitted By Ady TZIDON. Solution posted on 2014-11-10 21:29:29
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