A pupil's marks were wrongly entered as 83 instead of 63. Due to the average marks for the class got increased by half. The number of pupils in the class is:
Options:
A . 10
B . 20
C . 40
D . 73
Answer: Option C
Let there be x pupils in the class.Total increase in marks = (x * 1/2) = x/2x/2 = (83 - 63) => x/2 = 20 => x = 40.
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