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Any number when doubled becomes even. Thus the key part of the question is identifying a 3 digit even number that you can add 2 to to become a 4 digit number. The answer is 998. Thus to find the original number we need to do 998/2. This calculates to 499.

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Q: What is a 3 digit whole number when doubled remains a 3 digit number When you add 2 to the doubled number it becomes a 4 digit number?
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