Discussion :: Average
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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:
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Answer : Option C
Explanation :
Let there be x pupils in the class.
Total increase in marks = [ x x \(\frac { 1 } { 2 }\)] =\(\frac { X } { 2 } \)
\(\frac { X } { 2 } \)= (83 - 63) 
\(\frac { X } { 2 } \)= 20 x= 40.
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