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      Question

      In a school, 40% of the students are girls, and 60% are

      boys. Half of the boys are enrolled in class 12, while the remaining 840 boys are in class 10. What is the total number of girls in the school?
      A Rs.1120 Correct Answer Incorrect Answer
      B Rs.2000 Correct Answer Incorrect Answer
      C Rs.2100 Correct Answer Incorrect Answer
      D Rs.1240 Correct Answer Incorrect Answer

      Solution

      ATQ;
      Let total population = 't'
      Boys = 60% of 't', Girls = 40% of 't'
      50% of the boys are enrolled in class 12,
      So, 50% are enrolled on class 10
      Number of boys who enrolled in class 10 = 0.50 × (0.60T) = 0.30T
      Given
      0.30t = 840
      Hence t = 840 ÷ 0.30 = 2800
      Number of girls = 40% of 2800 = 1120

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