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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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> Just Math (3)> Science> Algorithms
Determine all possible pairs (X, M) of positive integers such that:

XM+2M+1 divides XM+1+2M+1+1

(No Solution Yet, 0 Comments) Submitted on 2016-02-06 by K Sengupta   
In I Only Need Two, you have 12 30g coins, 5 35g coins and a balance scale. As shown previously you can identify 2 of the 35g coins with 4 weighings. How many weighings are required if the scales can only weigh a maximum of 6 coins per side?
(Solution Posted, 1 Comments) Submitted on 2006-01-23 by Vernon Lewis   
Difficulty: 4 of 5Pumpkins 7 (in Just Math) Rating: 4.00
Posted on 2016-02-05 by Brian Smith (Solution Posted, 2 Comments)
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Posted on 2016-02-05 by Ady TZIDON (No Solution Yet, 2 Comments)
Difficulty: 3 of 5a version of NIM (in Games) Rating: 3.00
Posted on 2016-02-04 by Ady TZIDON (No Solution Yet, 3 Comments)
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Posted on 2016-02-04 by Charlie (No Solution Yet, 6 Comments)
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Posted on 2016-02-03 by Jer (No Solution Yet, 1 Comments)
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Posted on 2016-02-02 by Ady TZIDON (No Solution Yet, 8 Comments)
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Posted on 2016-02-02 by K Sengupta (No Solution Yet, 1 Comments)
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Posted on 2016-02-01 by K Sengupta (No Solution Yet, 3 Comments)
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Difficulty: 3 of 5Tangents (in Geometry)
Posted on 2016-01-31 by Bractals (No Solution Yet, 0 Comments)
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Posted on 2016-01-30 by K Sengupta (No Solution Yet, 0 Comments)
Difficulty: 4 of 5The real McCoy (in Weights and Scales)
Posted on 2016-01-29 by Ady TZIDON (No Solution Yet, 1 Comments)
Difficulty: 3 of 5N Nine Nuance (in Just Math)
Posted on 2016-01-29 by K Sengupta (No Solution Yet, 6 Comments)

Recently Posted Solutions:
Difficulty: 4 of 5Pumpkins 7 (in Just Math)
Submitted By Brian Smith. Solution posted on 2016-02-06 11:17:25
Difficulty: 3 of 5One of Sixteen (in Weights and Scales)
Submitted By Brian Smith. Solution posted on 2016-02-04 12:40:38
Difficulty: 4 of 5Pumpkins 6 (in Numbers)
Submitted By Brian Smith. Solution posted on 2016-02-03 11:12:30
Difficulty: 1 of 5Three Block Quickie (in Weights and Scales)
Submitted By Brian Smith. Solution posted on 2016-01-30 10:43:15
Difficulty: 3 of 5A Math Problem (in Just Math)
Submitted By broll. Solution posted on 2016-01-30 00:18:55
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