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 funny numbers (Posted on 2004-07-28)
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

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