All about flooble | fun stuff | Get a free chatterbox | Free JavaScript | Avatars    
perplexus dot info

Home > Numbers
funny numbers (Posted on 2004-07-28) Difficulty: 1 of 5
X and Y are positive integers, neither of which is divisible by 10. Their product is 100,000.

What is X + Y ?

See The Solution Submitted by Thalamus    
Rating: 2.3636 (11 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
Solution solution | Comment 14 of 19 |

As neither X nor Y is divisible by 10 neither can have both 2,5 as a prime factore. As their prime factors must be identical with that of 10000 by the fundamental theorem of algebra, we must have that X contains all 2's and Y all 5's or vice versa.

As 100 000 = 10^5 then X=2^5 = 32 , Y=5^5 = 3125

their sum is thus 3157


  Posted by neshal on 2004-08-02 05:57:11
Please log in:
Login:
Password:
Remember me:
Sign up! | Forgot password


Search:
Search body:
Forums (0)
Newest Problems
Random Problem
FAQ | About This Site
Site Statistics
New Comments (3)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On

Chatterbox:
Copyright © 2002 - 2017 by Animus Pactum Consulting. All rights reserved. Privacy Information