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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