To calculate the bearing of Y from Z, we need to find the angle between the line segment connecting Z and Y and the north direction.
Given that the bearing of X from Z is 125° and the bearing of X from Y is 105°, we can determine the bearing of Y from Z by subtracting the bearing of X from Y from the bearing of X from Z.
Bearing of Y from Z = Bearing of X from Z - Bearing of X from Y
Bearing of Y from Z = 125° - 105°
Bearing of Y from Z = 20°
Therefore, the bearing of Y from Z is 20°.