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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 ?

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

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Solution Solution | Comment 5 of 19 |

The prime factorization of 100000 is 2^5 x 5^5. If two numbers multiply to 100000 and neither is divisible by 10 (2 * 5), then one must be 2^5 and the other 5^5.

Those numbers are 32 and 3125, respectively, and their sum is 3157.

(I think this was too easy for a perplexus puzzle, but the voters have spoken)


  Posted by DJ on 2004-07-28 09:43:36
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