Point (x,y) is randomly picked from the rectangular region with vertices at (0,0), (10,0), (10,11), (0,11). What is the probability that x > 2y?
From this graph, you can see that the triangle outlined by the red, green and black is the successful region. You know this because 10>2(0) and 10,0 is a point in this region. The area of this triangle is 11x5 * 1/2 = 27.5