Find m∠pqr. (im just writing this to fill in the spaces)

now, let's notice the minor arc of 26x°, let's recall that a circle has a total of 360°, thus if the minor arc is 26x°, then the major arc has to be the difference of 360 and that much, namely 360 - 26x.

Check the picture below.

yes. we do proportions in probabilities.