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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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Find all possible couples of distinct integers (x,y) satisfying the equation: x^4 + y = x^3 + y^2
(No Solution Yet, 1 Comments) Submitted on 2017-01-21 by Ady TZIDON   
Difficulty: 3 of 5 Bonus: The Kind Grandparents (in Just Math) Rating: 3.78
When you were born, both of your rich grandparents made a deal with your parents, to do with what money they'll give you for birthdays. Grandad's deal was :

I'll give you 1 for your first birthday. Then, the amounts that I give you each year will double every time

and Grandma said :

I will start by giving you 1 for your first birthday. Then, the amount I give you will be the combined total of all the last birthday presents that I have ever given you up to that point. Plus, every birthday you have that's a multiple of five, I'll give you an extra five pounds.

a)What amount of money do they each pay you for your 15th birthday

and

Who would have given you the most after 27 years?

(No Solution Yet, 17 Comments) Submitted on 2003-09-30 by Lewis   
Difficulty: 3 of 5Six (or more) sextuples (in Numbers)
Posted on 2017-01-20 by Ady TZIDON (No Solution Yet, 0 Comments)
Difficulty: 4 of 5777-111 (in General)
Posted on 2017-01-19 by Ady TZIDON (No Solution Yet, 1 Comments)
Difficulty: 3 of 5Topical Quotation V (in Word Problems)
Posted on 2017-01-18 by Charlie (No Solution Yet, 1 Comments)
Difficulty: 3 of 5An interesting recurrence (in Numbers) Rating: 5.00
Posted on 2017-01-17 by Math Man (No Solution Yet, 5 Comments)
Difficulty: 2 of 5Age Progression (in Numbers)
Posted on 2017-01-16 by Brian Smith (No Solution Yet, 3 Comments)
Difficulty: 2 of 5When is it a square? (in Just Math)
Posted on 2017-01-15 by Ady TZIDON (Solution Posted, 1 Comments)
Difficulty: 4 of 5Square OR 2*square (in Numbers)
Posted on 2017-01-14 by Ady TZIDON (No Solution Yet, 2 Comments)
Difficulty: 3 of 5Squares sum up to a prime (in Just Math)
Posted on 2017-01-13 by Ady TZIDON (Solution Posted, 4 Comments)
Difficulty: 3 of 52nd grade math (in Probability)
Posted on 2017-01-12 by Jer (No Solution Yet, 4 Comments)
Difficulty: 3 of 5Alphabetical Crossword (in Word Problems)
Posted on 2017-01-11 by Charlie (Solution Posted, 2 Comments)
Difficulty: 2 of 5Functional Question (in Just Math)
Posted on 2017-01-10 by Charlie (Solution Posted, 2 Comments)
Difficulty: 1 of 5Beginning of the Month (in Logic) Rating: 5.00
Posted on 2017-01-09 by Charlie (Solution Posted, 2 Comments)
Difficulty: 2 of 5Proving divisibility (in Just Math)
Posted on 2017-01-08 by Ady TZIDON (No Solution Yet, 2 Comments)
Difficulty: 3 of 5(x−y)^ n = xy (in Just Math)
Posted on 2017-01-07 by Ady TZIDON (No Solution Yet, 2 Comments)

Recently Posted Solutions:
Difficulty: 3 of 5Alphabetical Crossword (in Word Problems)
Submitted By Charlie. Solution posted on 2017-01-18 07:53:07
Difficulty: 2 of 5When is it a square? (in Just Math)
Submitted By Ady TZIDON. Solution posted on 2017-01-15 22:22:22
Difficulty: 3 of 5Squares sum up to a prime (in Just Math)
Submitted By Ady TZIDON. Solution posted on 2017-01-14 20:17:29
Difficulty: 1 of 5Beginning of the Month (in Logic)
Submitted By Charlie. Solution posted on 2017-01-12 12:06:14
Difficulty: 2 of 5Functional Question (in Just Math)
Submitted By Charlie. Solution posted on 2017-01-11 11:00:28
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