The total number of students in a school is 1400, out of which 35% of the students are girls and the rest are boys. If 80% of the boys and 90% of the girls passed in an annual examination, then the percentage of the students who failed is :
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 16.5
Number of girls = 35% of 1400 = 490.
Number of boys = 1400 - 490 = 910.
80% of the boys and 90% of the girls passed an annual examination,
Total passed student = 80% of 910 + 90% of 490 = 728 + 441 = 1169.
Total failed student = 1400 - 1169 = 231.
% of failed student = 231/1400 × 100 = 16.5%