Question

please solve this 13 one

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a

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Answer 1

let the total no. of students be x

average marks of class = total marks of all student/total no. of students

total marks of student is 5+12+15+19 + 44*(x-4)

so 39 = (44x - 125)/x

39x = 44x - 125

5x = 125

x = 25

hope u like it

Answer 2

44(×-4)+5+12+15+19=30×

5×=125

x=25