Teaching Bihar Sakshamta Pariksha (Niyojit Shikshak) Mock Test 2024 Quantitative Aptitude Average

A student's marks was wrongly entered as 83 instead of 63. Due to this mistake, the average marks for the class got increased by 1/2. Number of students in the class is equal to : 

1
45 
2
40 
3
35 
4
30
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