Question 23
Among 132 examineesof a certain school, the ratio of successful to unsuccessful students is 9 : 2, Had 4 more students passed, then the ratio of successful to unsuccessful students will be
Solution
the ratio of successful to unsuccessful students is 9 : 2
total number of examines = 132
successful students = $$\frac{9}{11} \times $$132 = 108
unsuccessful students = $$\frac{2}{11} \times $$132 = 24
had 4 more students passed
successful students = 108 + 4 = 112
unsuccessful students = 24 - 4 = 20
new ratio of successful to unsuccessful students is 112 : 20
28:5
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