



 
Hello. I'll try to help you see how to solve it. If the number is less than one hundred and greater than 89, then it must be 90, 91, 92, 93, 94, 95, 96, 97, 98, or 99. What is the ten's digit for all these possibilities? The ten's digit is 2 more than the one's digit, so what must the one's digit be? Cheers,  


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