In a class of 100 students, 20 did not opt for biology, 45 did not opt for maths and 32 did not opt for either. How many students of the class opted for both biology and math?
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Answer:
3
Step-by-step explanation:
The total number of students = 100
The total number of students who did not opt for either and who did not opt for biology or maths = 20+45+32 = 97
So the remaining students must have opted for both the subjects.
Therefore, remaining students who opted for both the subjects = 100-97 = 3
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