A student's marks were wrongly entered as 83 instead of 63. Due to the error the average marks for the class got increased by 0.5. Find the number of students in the class.
Solution
Correct Answer: Option C
নাম্বার বেশি পায় = 83 - 63 = 20
প্রশ্নমতে,
0.5 অংশ বৃদ্ধি = 20
∴ 1 অংশ বৃদ্ধি = 20/0.5 = 40
∴ ছাত্র-ছাত্রী সংখ্যা = 40
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