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- Quantitative Aptitude
4.Average
medium
The average of marks obtained by $150$ candidates in a certain examination is $50 .$ If the average marks of passed candidates is $55$ and that of the failed candidates is $25,$ what is the number of candidates who passed the examination?
A
$125$
B
$120$
C
$140$
D
$160$
Solution
Let the number of candidates who passed $=x$
According to question
$55 \times x+25(150-x)=150 \times 50$
$55 x-25 x=7500-3750=3750 / 30 \Rightarrow x=125$
Hence no of candidate who passed the exam $=125$
Standard 13
Quantitative Aptitude