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 .
Let there be `x` pupils in the class
Total increase in marks = `(x xx 1/2)` = `x/2`
`:.` `x/2` = 83 - 63 `hArr` `x/2` = 20 `hArr` `x` = 40.
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