Subject
Quantitative Aptitude
Topic
Average
A pupil's marks were wrongly entered as 83 instead of Due to that the average marks for the class got increased by half (1/2). The number of pupils in the class is:
A pupil's marks were wrongly entered as 83 instead of Due to that the average marks for the class got increased by half (1/2). The number of pupils in the class is:
ক)
10খ)
20গ)
40ঘ)
73Explanation
Let there be x pupils in the class. Total increase in marks =( x × ½) = x/2 So, x/2 = (83 - 63) => x/2 = 20 => x= 40.Related questions
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