



 
Hi there. Let n = the 5 digit whole number.
That's 2n.
That makes 2n + 200.
That makes (2n + 200) / 2 = n + 100.
That makes n + 100  100 = n, the original number.
That would be the greatest number that satisfies the original constraints on n. It is a five digit whole number, so what is the greatest one of those? Stephen.  


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