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4.Average
medium
The average marks of $120$ students are $35.$ If average of passed students was $39$ and failed students was $15,$ then Find the number of students who have passed?
A
$80$
B
$100$
C
$120$
D
$140$
Solution
Let the no of passed student $= x$
According to the question
$x \times 39+15(120-x)=120 \times 35$
$39 x-15 x=4200-1800$
$24 x=2400 \Rightarrow x=100$
Hence no of passes student is $100 .$
Standard 13
Quantitative Aptitude
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