I don't understand how to approach this

Preview File Edit View Go Tools Window Help US Q 8 0 Tue Sep 6 5:26 PM ... Screen Shot 2022-09-06 at 5.25.55 PM Q Search An anonymous survey of college students was taken to determine behaviors regarding alcohol, cigarettes, and illegal K drugs. The results were as follows: 846 drank alcohol regularly, 640 smoked cigarettes, 205 used illegal drugs, 407 M Screen Shot 2022-07...3.12 PM drank alcohol regularly and smoked cigarettes, 121 drank alcohol regularly and used illegal drugs, 123 smoked cigarettes and used illegal drugs, 96 engaged in all three behaviors, and 214 engaged in none of these behaviors. Screen Shot 2022-0....31.03 AM a) How many students were surveyed? 0 Of those surveyed, Screen Shot 2022-0....19.16 AM b) How many drank alcohol or used illegal drugs? c) How many used illegal drugs only? Screen Shot d) How many drank alcohol and smoked cigarettes, but did not use illegal drugs? 2022-0....19.27 AM e) How many smoked cigarettes or used illegal drugs, but did not drink alcohol? f) How many engaged in exactly two of these behaviors? Screen Shot 2022-0...32.49 AM g) How many engaged in at least one of these behaviors? Screen Shot 2022-0....27.38 PM bio SEP 6 1066 039