72% of the students of a certain class took Biology and 44% took Mathematics. If each student took at least one subject from Biology or Mathematics and 40 took both, then the total number of students in the class is :
Options:
A . 250
B . 240
C . 320
D . 200
Answer: Option A Answer: (a)Let the number of students in the class be 100.Number of students in Biology = 72 and number of students in Maths = 44.Number of students opting for both subjects = 72 + 44 – 100 = 16Since, When 16 students opt for both subjects, total number of students = 100When 40 students opt for both subjects, total number of students = $100/16 × 40$ = 250
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