A pupil's marks were wrongly entered as 79 instead of 45. Due to that the average marks for the class got increased by half. The number of pupils in the class is :
Choose the correct option:
A) 30
B) 80
C) 20
D) 68
E) 26
Let there be x pupils in the class.   Total increase in marks = (X*1/2) = X/2.   X/2 = (79 - 45)   =&gt; X/2 = 34   =&gt; X = 68.   ANSWER:68
<result>D</result>
A pupil's marks were wrongly entered as 79 instead of 45. Due to that the average marks for the class got increased by half. The number of pupils in the class is :