In this case, we'll have to carry out several steps to find the solution.
Step 01:
Data
9/15 8/9 11/11 11/12
improper fraction = ?
Step 02:
improper fraction:
numerator is equal or greater than the denominator
9/15 ===> false
8/9 ===> false
11/11 ===> true
11/12 ===> false
The answer is:
11/11 ===> improper fraction