New Enroll in RBI Grade B New Batch - Starts on May 21

    Question

    In a school, 30% of the students are not participating

    in any competition. 80% of the students who are participating in the competition are girls. If 4200 boys are participating in the competition, find the total number of students in the class?
    A 40,000 Correct Answer Incorrect Answer
    B 35000 Correct Answer Incorrect Answer
    C 45000 Correct Answer Incorrect Answer
    D 30,000 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Sol. Let total number of students be x Total number of participating students = 70% of x Number of boys who are participating = 20% of 70% of x As per the question, number of boys = 4200 20% of 70% of x= 4200 ⇒ x =4200*100/70*100/20=30,000 Total number of students = 30,000.

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