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Question

If 20 students in a class failed an exam, the probability of a student selected at random getting passed in an exam is 0.6. The number of students in the class is = ___ .


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Solution

Let the number of students in a class be x.

The probability of students passing an exam = 0.6

Number of students who failed an exam = 20

Number of students who passed an exam =x20

Probability of a student passing an exam =Number of students who passed an examsNumber of students in a class

0.6=x20x

0.6x=x20

0.4x=20

x=50

The number of students in the class is 50.


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