The average marks obtained by 180 students in | vedclass

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Question

(B) Let the number of failed students be $x$.Then,the number of passed students is $(180 - x)$.The total marks obtained by all students is $180 	imes

Vedclass · Accepted Answer

$135$

Vedclass · Answer

(B) Let the number of failed students be $x$.Then,the number of passed students is $(180 - x)$.The total marks obtained by all students is $180 	imes 50 = 9000$.The total marks obtained by passed students is $(180 - x) 	imes 80$.The total marks obtained by failed students is $x 	imes 40$.According to the problem:$(180 - x) 	imes 80 + 40x = 9000$$14400 - 80x + 40x = 9000$$14400 - 40x = 9000$$40x = 14400 - 9000$$40x = 5400$$x = \frac{5400}{40} = 135$.Therefore,the number of students who failed the examination is $135$.

The average marks obtained by $180$ students in an examination is $50$. If the average marks of passed students is $80$ and the average marks of failed students is $40$,then what is the number of students who failed the examination?

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