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