Problem: In an examination 80% of the total students passed in Mathematics and 90% in BanglaNo student failed in \both the subjects. 0n the other hand. 350 students passed \both i:Mathematics and Bangla. What is the total number of students that appeared in thaexamination?
একটি পরীক্ষায় ৮০% ছাত্র 80) এ এবং ৯০% ছাত্র বাংলায় পাশ করল 1 কেউই উডয় বিষয়ে ফেল করেনি । অন্যদিকে ৩৫০ জন ছাত্র 148) ও বাংলা উভয় বিষয়েই পাশ করে । প্রশ্ন হলো কতজন ছাত্র পরীক্ষায় অংশগ্রহণ করে?

View all: BANGLADESH BANK(AB) | WRITTEN QUESTION (MATH) SOLVE | 1992

Correct Answer: ans: 500 Students.

Explanation:

Students failed in Mathmatics = (100 – 80) = 20%

Students failed in Bangla = (100 – 90) = 10%

Students failed in Mathmatics and Bangle = 30%

Students passed in \both subjects = (100 — 30) = 70%

Since 70 students passed in \both subjects, then total students were = 100 students

Since 350 students passed in \both subjects, then total student were =500 student

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