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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 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. Correct Answer 0.66

প্রশ্নে বলা হচ্ছে, একটি স্কুলে মাত্র 4 টি ক্লাস রয়েছে। ক্লাসগুলোতে যথাক্রমে 10, 20, 30 এবং 40 জন ছাত্র রয়েছে। ঐ ক্লাসগুলোতে পাসের হার যথাক্রমে 20%, 30%, 60% এবং 100% মোট শিক্ষার্থীর কত শতাংশ পাস করেছে? 4টি ক্লাসে মোট ছাত্র আছে = 10 + 20 + 30 + 40 = 100 জন ১ম ক্লাসে পাস করে = 10 এর 20% = 2 জন ২য় ক্লাসে পাস করে = 20 এর 30% = 6 জন ৩য় ক্লাসে পাস করে = 30 এর 60% = 18 জন ৪র্থ ক্লাসে পাস করে = 40 এর 100% = 40 জন মোট পাস করে = 2 + 6 + 18 + 40 = 66 জন শতকরা পাস করে = (66100×100)%  =  66%

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