I AM A NUMBER GREATER THAN 99 AND LESS THAN 1,000. TWO OF MY DIGITS THAT AREN'T NEXT TO EACH OTHER ARE THE SAME. MY TENS DIGIT COULD NOT BE GREATER AND IT IS 1 MORE THAN MY HUNDREDS DIGIT. WHAT NUMBER AM I?

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You are looking for a 3-digit number. The first and last digits of the three must be the same. The middle (tens) digit must be 9, since it could not be greater. It is one greater than the hundreds (and ones) digit.

898 meets those criteria.