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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 :
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- 200
- 240
- 250
- 320
Correct Option: C
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 = 16
∵ When 16 students opt for both subjects, total number of students = 100
∴ When 40 students opt for both subjects, total number of students
| = | × 40 = 250 | 16 |
