There are 36 students in the class.
Given that in a class, 24 students read physics, 21 students read Maths and 9 students read both physics and maths, if each student read at least one of the two subjects, to find the number of the students in the class the following calculation must be made:
- The number of students who read both subjects must be added to the number of students who read each subject in particular (subtracting the students who read both subjects).
- 9 + (24 - 9) + (21 - 9) = X
- 9 + 15 + 12 = X
- 36 = X
Therefore, there are 36 students in the class.
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