a pupil ' s marks were wrongly entered as 35 instead of 23. due to that the average marks for the class got increased by half. the number of pupils in the class is:
Choices.
A) 30
B) 80
C) 20
D) 25
E) 24
<gadget id="calculator">35 - 23</gadget>
<output>12</output>

<gadget id="calculator">12 * 2</gadget>
<output>24</output>

<result>E</result>
a pupil ' s marks were wrongly entered as 35 instead of 23. due to that the average marks for the class got increased by half. the number of pupils in the class is:
multiply(subtract(35, 23), const_2)
let there be x pupils in the class . total increase in marks = ( x * 1 / 2 ) = x / 2 . x / 2 = ( 35 - 23 ) = > x / 2 = 12 = > x = 24 . answer : e