In following figure, XA is parallel to PQ. What is the value (in degrees) of angle YBP.

Show answer & explanation
Correct answer: B
Explanation
Given:
XA ∥ PQ, ∠XYB = 115°, ∠OPQ = 145°
According to the formula:
The sum of co-interior angles between parallel lines = 180°
∠YBP = 115° + 145° − 180°
= 260° − 180°
= 80°