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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)

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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)


"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
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