A pupil-s marks were wrongly entered as 83 instead of 63- Due to that the average marks the class got increased by half- The number of pupils in the class is -10204073

Question

Toppr Admin · Accepted Answer

Let there be x pupils in the classTotal increase in marks - x-xD7-12-x2x2-83-x2212-63 -x21D2-x-20-xD7-2-x2234-x-40

A pupil's marks were wrongly entered as $83$ instead of $63$ . Due to that the average marks for the class got increased by half. The number of pupils in the class is :
$10$
$20$
$40$
$73$

Let there be x pupils in the class
Total increase in marks = $x \times \frac{1}{2} = \frac{x}{2}$
$\frac{x}{2} = 83 - 63$ $\Rightarrow x = 20 \times 2$
$∴ x = 40$

A pupil's marks were wrongly entered as 83 instead of 63. Due to that the average marks for the class got increased by half. The number of pupils in the class is :10204073

Let there be x pupils in the classTotal increase in marks = x×12=x2x2=83−63 ⇒x=20×2∴x=40

A pupil's marks were wrongly entered as $83$ instead of $63$ . Due to that the average marks for the class got increased by half. The number of pupils in the class is :
$10$
$20$
$40$
$73$

Let there be x pupils in the class
Total increase in marks = $x \times \frac{1}{2} = \frac{x}{2}$
$\frac{x}{2} = 83 - 63$ $\Rightarrow x = 20 \times 2$
$∴ x = 40$