Among 120 visitors to Disneyland, 74 stayed for at least 3 hours, 86 spent at least $ 20, 64 went on the Matterhorn ride, 60 stayed for at least 3 hours And spent at least $ 20, 52 stayed for at least 3 hours And went on the Matterhorn ride, 54 spent at least $ 20 And went on the Matterhorn ride, And 48 stayed for at least 3 hours, spent at least $ 20, And went on the Matterhorn ride. Drawing a Venn diagram with three circles (like that of Figure 2.4) And filling in the numbers associated with the various regions, find how many of the 120 visitors to Disneyland
(a) Stayed for at least 3 hours, spent at least $ 20, but did not go on the Matterhorn ride;
(b) Went on the Matterhorn ride, but stayed less than 3 hours And spent less than $ 20;
(c) Stayed less than 3 hours, spent at least $ 20, but did not go on the Matterhorn ride.