Question
In a school, girls constitute 45% of the total strength
of the school. Out of total number of students, 20% students were selected for annual sports competition which is 420 less than number of boys in the school. Find the number of girls selected for annual sports if the number of boys selected is 140.Solution
Let total number of students in the school be ‘x’
According to the question,
0.20x + 420 = 0.55x
Or, x = 420/0.35 = 1200
Number of girls selected = 0.20x – 140 = 100
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