Just a small point for discussion,
when they say Traditional or Modern it means T +M- Both.
So T+M-Both =100
now when they say T= 65 and the rest is Modern, how are we assuming that M= 35 and Both = 0 ?
It could be T= 65, M= 45 and Both = 10 ( or any other combination that leads to a 100% )
or T= 65, M= 35, Both = 0 ( as done in the problem)
if there are no students taking both , then Both = 0 then of course the problem is easy to understand, but why and how are we assuming that B= 0, when it says T or M, which means T+M-both .
Nowhere does it state that the student cannot take both,is this common knowledge?