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?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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