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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 (1)> General
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> Just Math (2)> Science> Algorithms
Difficulty: 3 of 5 Latest: Divisible by 28 (in Just Math)
Each of a, b and c is a positive integer with a ≤ b ≤ c ≤ 70.

Find total number of triplets (a, b, c) such that a2 + b2 + c2 is divisible by 28.

(No Solution Yet, 2 Comments) Submitted on 2014-12-21 by K Sengupta   
Difficulty: 2 of 5 Bonus: In the Act (in General) Rating: 3.73
A mother is 21 years older than her son, and in 6 years time the son will be one fifth of her age.

Where is the father?

(Solution Posted, 14 Comments) Submitted on 2002-11-25 by Cheradenine   
Difficulty: 4 of 5The medians of medians (in Just Math)
Posted on 2014-12-20 by Ady TZIDON (No Solution Yet, 5 Comments)
Difficulty: 3 of 5Arithmetic Numbers Enumeration (in Sequences)
Posted on 2014-12-19 by K Sengupta (No Solution Yet, 2 Comments)
Difficulty: 3 of 5Origamic Revisited (in Shapes)
Posted on 2014-12-19 by K Sengupta (No Solution Yet, 1 Comments)
Difficulty: 2 of 5Compare sizes (in Just Math)
Posted on 2014-12-18 by Ady TZIDON (No Solution Yet, 3 Comments)
Difficulty: 2 of 5m & n (in Just Math)
Posted on 2014-12-18 by Ady TZIDON (No Solution Yet, 2 Comments)
Difficulty: 3 of 5Floor Fulfilment (in Just Math)
Posted on 2014-12-17 by K Sengupta (No Solution Yet, 2 Comments)
Difficulty: 2 of 5Solve in integers (in Just Math)
Posted on 2014-12-17 by Ady TZIDON (No Solution Yet, 3 Comments)
Difficulty: 3 of 5Power Sum Poser (in Just Math)
Posted on 2014-12-16 by K Sengupta (No Solution Yet, 2 Comments)
Difficulty: 2 of 5Equation Exercise (in Just Math)
Posted on 2014-12-16 by K Sengupta (No Solution Yet, 2 Comments)
Difficulty: 3 of 5Geometric and Harmonic Harmony (in Just Math) Rating: 5.00
Posted on 2014-12-15 by K Sengupta (No Solution Yet, 3 Comments)
Difficulty: 3 of 5Cash and chit (in General)
Posted on 2014-12-15 by Ady TZIDON (No Solution Yet, 1 Comments)
Difficulty: 3 of 5Extreme Cardioid Exercise (in Shapes)
Posted on 2014-12-14 by K Sengupta (No Solution Yet, 0 Comments)
Difficulty: 3 of 5Extreme Ellipse Exercise (in Shapes)
Posted on 2014-12-13 by K Sengupta (No Solution Yet, 0 Comments)
Difficulty: 3 of 5Cube Difference Deduction (in Just Math) Rating: 5.00
Posted on 2014-12-12 by K Sengupta (No Solution Yet, 2 Comments)

Recently Posted Solutions:
Difficulty: 4 of 5Spacy Colors Lemma (in Just Math)
Submitted By Bractals. Solution posted on 2014-12-19 19:53:51
Difficulty: 3 of 5One in Eight (in Cryptography)
Submitted By Charlie. Solution posted on 2014-12-17 17:33:37
Difficulty: 4 of 5Test #7 (in Word Problems)
Submitted By Ady TZIDON. Solution posted on 2014-12-07 16:04:19
Difficulty: 2 of 5Searching for c among the cubes (in Just Math)
Submitted By broll. Solution posted on 2014-11-30 00:11:11
Difficulty: 3 of 5Integers only (in Sequences)
Submitted By Ady TZIDON. Solution posted on 2014-11-26 02:59:02
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