Subject: General Aptitude · Chapter: Ratio and Proportion · Exam: · Marks: · Difficulty:
Of 132 examinees of a certain school, the ratio of successful to unsuccessful candidates is 9 : 2. If 4 more students passed, what would have been the ratio of successful to unsuccessful students?
(a)25 : 4
(b)4 : 25
(c)28 : 5
(d)3 : 28
Answer
Answer (as printed): C
Explanation
Number of successful candidates $=\left(\frac{9}{11} \times 132\right)=108$. Number of unsuccessful candidates $=\left(\frac{2}{11} \times 132\right)=24$. $$\text { ∴ } \text { Required ratio }=(108+4):(24-4)=112: 20=28: 5 .$$
Explanation as extracted from the printed page; notation may be imperfect.