Question
In an examination, the average marks obtained by the
students is 60. After correcting the quantitative mistakes, the average of 100 students is reduced to 45 from 60 and the overall average of the student is reduced to 50. Then find the total number of students who participated in that examination.Solution
Let the total number of students be x Average marks obtained by the students = 60 Total marks = 60x After correcting the quantitative mistakes the average decreased by (60-45) = 15 marks Total reduction = 15 × 100 = 1500 Now According to the Question, (60x-1500)/x = 50 (60x-1500)= 50x
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