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1. 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:





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  • By: guest on 01 Jun 2017 05.44 pm
    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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