Of the five people in the city, 1 subscribed to magazine A, 2 subscribed to magazine B, 3 subscribed to magazine C, 5 subscribed to magazine D. If three people subscribed to two magazines and one person subscribed to all the magazines, how many magazines did the fifth person subscribe?
This is not a proper way to solve question but I think it works ....
Total number of subscriptions = 1(A) + 2(B) + 3(C) + 5(D) = 11
3 people subscribe to 2 magazines each (6 subscriptions)
1 person subscribes to all 4 (4 subscriptions)
Total subscriptions is 10
The difference is the answer. 1 magazine.