72% of the students of a certain class took Biology and 44% took Mathematics. If each student took at least one of Biology or Mathematics and 40 students took both of these subjects, the total number of students in the class is
% of students took biology = 72%
% of students took mathematics = 44%
% of students took both subjects = (72 + 44) - 100
                         = 16%
According to the question
let the total number of students be N
Then, 16% of N = 40
On solving, N=250
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