#### Answer

10

#### Work Step by Step

Let A = honor students and B = officers
By the given statements, we have:
$A=20$
$A \cap B =9$
The number of students who are only honors students: $20 - 9 =11$
The total number of students is 30.
Subtract to find the number of commuters who are officers but not honor students: $30-20=10$