Question

In a survey of 100 outpatients who reported at a hospital one day,it was found that 70 complained of fever, 50 had stomach trouble, and 30 were injured. All the 100 patientshad one or the other of these complaints, and 44 had exactly two of them. How many patients had all three complaints?

Answer 1

I would like to think it'd be 56 patients, because by subtracting 100 from 44 the total is 56 patients, which seems reasonable.
I hope this helps!