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Question 177984: Of the whole numbers 10, 11, . . . 98, 99 how many are greater than the sum of their digits?
Answer by Mathtut(3670)   (Show Source):
You can put this solution on YOUR website!
2 digit numbers can be written in this form
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ab=10a+b
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now the question is, of whole numbers, how many are greater than the sum of there digits. So they are asking when
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ab>a+b or
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when is 10a+b>a+b.
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the answer is all of them are greater than the sum of their digits, as b is always equal to b and 10a is always 10 times greater than a
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