A student's mark was wrongly entered as 83 instead of 63. Due to that the average marks for the class got increased by
1/2. What is the number of students in the class?  Choose the correct option:
A) 45
B) 40
C) 35
D) 30
E) 50
Explanation:   Let the total number of students = x   The average marks increased by 1/2 due to an increase of   83 - 63= 
<gadget id="calculator">  83 - 63</gadget>
<output>20</output>
20 marks.   40ut total increase in the marks= 1/2×x=x/2   Hence we can write as   x/2=20   ⇒x=20 x 2=40   Answer: Option 40
<result>B</result>
A student's mark was wrongly entered as 83 instead of 63. Due to that the average marks for the class got increased by
1/2. What is the number of students in the class?