The sum of a number b and 3 is greater than 8 and less then 12

The sum of a number b and 3 is greater than 8 and less than 12 = > b + 3 < 8

=> b + 3 > 12

Now, let’s combine this into an expression:

=> 8 < b+3 < 12

=> (8 - 3) < b < (12 - 3)

=> 5 < b < 9

Thus, the answer in the given situation is 9 because 9 is greater than 8 but less than 12.