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Let the total number of students be x Average marks obtained by the students = 75 Total marks = 75 x After correcting the quantitative mistakes the average decreased by (75-60) = 15 marks Total reduction = 15 × 100 = 1500 Now According to the Question, (75x-1500)/x = 70 70 x = 75 x – 1500 x = 300 Total number of students = 300
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