railway RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2) Quantitative Aptitude Average

Ravi’s marks were wrongly entered as 83 instead of 63 in a class test. Because of this mistake, the average marks for the class got increased by half. The number of students in the class is?

1
20
2
30
3
40
4
50
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