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Q1
:
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 (1/2). The number of pupils in the class is:
A
20
B
73
C
10
D
40
Solution
ANS:
C
- 40
Let there be
x
pupils in the class.
Total increase in marks =
x
x
1
=
x
2
2
x
= (83 - 63)
x
= 20
x
= 40.
2
2
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