Gujarati
Hindi
4.Average
medium

The average marks obtained by $150$ students in an examination is $40 .$ If the average marks of passed students is $60$ and that of the failed students is $20,$ what is the number of students who passed the examination ?

A

$25$

B

$50$

C

$75$

D

$100$

Solution

No, of passed Students be $x$

No. of failed Students be $150-x$

$\therefore \frac{(150-x) 60+20 x}{150}=40$

$9000-60 x+20 x=6000$

$40 x=3000$

$x=75$

Standard 13
Quantitative Aptitude

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