Problem 1: Since AR = AB, triangle ARB is isosceles. Also, arc AB is 130 degrees, so angle ARB is 130/2 = 65 degrees, which means angle RAB is also 65 degrees. Then arc RB is 130 degrees. Since arc AQ is 28 degrees, angle RPB is (130 + 28)/2 = 79 degrees.
Problem 2: Since arc POQ is 80 degrees, angle POQ is 160 degrees. Then major arc PQ is 360 - 160 = 200 degrees, so arc POQ on the smaller circle is (360 - 200) + 80 = 240 degrees.
Problem 3: Angle ABX = Angle AOX = 35 degrees, so Angle ABC = 180 - 35 = 145 degrees.