Practical trigonometry question I can't figure out (Highschool Level) "Jack is on a bearing of 260 degrees from Jill. What is Jill's bearing from Jack?"
The answer is 080 degrees. I really can't figure out how. Any help is appreciated.

Consider the following diagram:

The rule about bearings is: "Point north and go clockwise".
The bearing of Jill from Jack $(\theta)$ and the angle $\gamma$ ($=260-180)$ are alternate angles, so they're equal.
