My number has 2 hundreds. the tens digit is 9 more than the ones digit. my number is?

If the number has 2 hundreds we know the first digit is 2. So far our answer is 2... If the tens digit is 9 more than the ones digit than the only possible answer would be 290 because 9 more than 0 is 9. So the final answer is 290.

Hope I helped:D 

12+3b -1=-5-b -12-1+5=-b-3b -8=-4b