A school has only four classes having 10, 20, 30 and 40 students respectively with pass percentage of 20%, 30%, 60%, and 100% respectively. Find the pass-percentage of the entire school.

A 56%

B 76%

C 34%

D 66%

Solution

Correct Answer: Option D

এখানে,
20% of 10 =2/100×10=2
30% of 20=30/100×20=6
60% of 30 =60/100×30=18
100% of 40=100/100× 40=40
             Total =66
মোট ছাত্রছাত্রী 10+20+30+40=100
মোট পাসকৃত ছাত্রছাত্রী =66
পাসকৃত ছাত্র -ছাত্রীর সংখ্যা শতকরা =66%

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