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 choice from the following options
A) 40 B) 30 C) 35 D) 29 E) 60
Tot no of students = x   the avg marks increased 1/2 due to an increase of   83-63= 
<gadget id="calculator">  83-63</gadget>
<output>20</output>
20 marks   tot increase in the marks= 1/2*x=x/2   hence we can write as x/2 = 20   x=20*2= 
<gadget id="calculator">20*2</gadget>
<output>40</output>
40   40NSWER 40
<result>A</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?