Question:
In a class of 60 students comprising girls and boys, 30% are boys. On a given day 10% of the class is absent and all the absentees are boys. What is the percentage of girls in this class on that given day?
In a class of 60 students comprising girls and boys, 30% are boys. On a given day 10% of the class is absent and all the absentees are boys. What is the percentage of girls in this class on that given day?
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Always calculate the new "total" (denominator) after removing absentees to get the correct percentage.
Updated On: May 14, 2026
- 66.66
- 77.77
- 88.88
- 100
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The Correct Option is B
Solution and Explanation
Step 1: Concept
Calculate the initial number of boys and girls, then adjust for the absentees to find the new composition.
Step 2: Meaning
Total students = 60. Boys = 30% of 60 = 18. Girls = 60 - 18 = 42. Total absentees = 10% of 60 = 6.
Step 3: Analysis
Since all 6 absentees are boys, the number of students present = 60 - 6 = 54. The number of girls present remains 42.
Step 4: Conclusion
Percentage of girls present = (42 54) $\times$ 100 = (7 9) $\times$ 100 $\approx$ 77.77%. Final Answer: (B)
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