Final answer:
The length of qr is 11.
Step-by-step explanation:
To find the length of qr, we can use the fact that rs + qr = qs, where rs is known to be 5 and qs is known to be 16. By substituting these values into the equation, we have 5 + qr = 16. Solving for qr, we subtract 5 from both sides to get qr = 11.