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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 ?

  Submitted by Thalamus    
Rating: 2.3636 (11 votes)
Solution: (Hide)
Since the numbers are not divisible by 10, neither can have both a 5 and a 2 as factors. Yet, 100,000 = 10^5.

This equals 2^5 x 5^5, and therefore, one factor must be "all the twos", and the other factor must be "all the fives".

So, the two numbers are:
32 x 3125 = 100,000

And their sum is 3157

Comments: ( You must be logged in to post comments.)
  Subject Author Date
SolutionPuzzle SolutionK Sengupta2008-06-25 00:48:40
SolutionSolutionDej Mar2008-06-21 01:38:41
AnswerK Sengupta2008-06-20 06:03:17
SolutionsolutionDetti2004-10-07 03:07:14
SolutionsolutionJim2004-09-03 10:19:59
Solutionsolutionneshal2004-08-02 05:57:11
Elementary.Vee-Liem Veefessional2004-07-30 00:06:10
re: Vehe!Vee-Liem Veefessional2004-07-30 00:01:01
the SolutionNithin2004-07-29 02:08:31
VB, or not VB ? That is the question....Penny2004-07-28 15:22:56
SolutionReference by GooglingRichard2004-07-28 14:00:19
Some Thoughtsre: No SubjectDanny2004-07-28 12:05:42
Some Thoughtsre: No SubjectAdy TZIDON2004-07-28 10:57:15
No SubjectPenny2004-07-28 09:47:44
SolutionSolutionDJ2004-07-28 09:43:36
re: Vehe!Penny2004-07-28 09:07:44
Vehe!Vee-Liem Veefessional2004-07-28 08:57:38
SolutionSolutionPenny2004-07-28 08:34:05
SolutionAnswerOskar2004-07-28 08:22:36
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