alleryIn an exam 70% of students passed. If 90 students failed, find the total number of students.
A300
B250
C200
D350
Answer & Solution
Correct answer: A. 300
1. If 70% passed, 30% failed.
2. 30% of total = 90, so total = 90 * (100/30).
3. = 300.
4. So 300 students took the exam.
_Source: SSC CGL Quantitative Aptitude (Percentages), R.S. Aggarwal style and standard practice_
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