6 patients did not undergo any of the treatment

That's my answer :3
how could you say that? :)
11 is both right? so you minus 11 to both A and B then add them all and lastly minus it with 54... :)
ahh okay thank you :D
how about this other question regarding to math also :)
a selected number of constituents of a certain barangay were asked about their preference between classical and popular songs. Thirty-four of them like classical songs, no one likes popular songs only, and 5 like neither classical songs nor popular songs. If there are 39 selected constituents, how many constituents like both classical and popular songs?