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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