Question 72

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

Solution

% 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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