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I assume you mean the sum of the digits.
If the first digit is 1, the other two digits have to sum 10. There are 9 different possibilities for this, from 1 + 9 to 9 + 1.
If the first digit is 2, the other two digits have to sum 9. There are 10 different possibilities for this, 0 + 9 to 9 + 0.
Adding it all up, it seems there are 19 such numbers.
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Earn +20 ptsQ: How many whole numbers between 100 and 300 whose digits equal 11?
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How many whole numbers between 100 and 400 have the sum of their two digits equal to another digits?
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