Students of three different classes appeared in exam Pass average of 20 students of first class was ...........

Quantitative Aptitude ( CCS) Average

Students of three different classes appeared in exam. Pass average of 20 students of first class was 60%, pass average of 30 students of second class was 70% and pass average of 40 students of third class was 80% then what will be the approximate pass average of all students of three classes?

62%

66%

72%

76%

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Explanation:

Solution:
Sum of pass students of first, second and third class,
= (60% of 20) + (70% of 30)+ (80% of 40)
= 12+21+32 = 65
Total students appeared,
= 20+30+40 = 90
Pass average,
90…. 100
65 …. ? ==>72%(approx).