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

Home > Just Math
Produce a product (Posted on 2012-01-09) Difficulty: 1 of 5
A certain number N divided by one more than itself yields one fifth.
Another number M divided by one more than itself yields one fifth of itself.
It is quite easy to find the product M*N.

Try to do it " by heart" i.e. no calc, no pen, no paper.
.

No Solution Yet Submitted by Ady TZIDON    
Rating: 3.6667 (3 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
Solution re: I think I've got it ... S P O I L E R.. Comment 4 of 4 |
(In reply to I think I've got it ..... by K Sengupta)

KS,

"By heart"  solution is obtained as follows:

M+1=5      ==> M=4      from your (ii)

5*N=N+1    ==> N= 1/4  from your (i)

......................................

ERGO:   MN=1


  Posted by Ady TZIDON on 2012-01-15 00:58:19
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 (5)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On

Chatterbox:
Copyright © 2002 - 2014 by Animus Pactum Consulting. All rights reserved. Privacy Information