Hey there! :)
We know that horizontally straight lines equal 180°, because a full circle equals 360°.
So, because we are given 118° and already know that the full measure is 180°, we can simply subtract 118° from 180° to get the measure of ∠QPR.
180° - 118° = 62°
So, ∠QPR = 62°
~Hope I helped!~