Average of marks obtained by 100 candidates in a certain examination is 30 . If average marks of pas

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The average of marks obtained by $100$ candidates in a certain examination is $30 .$ If the average marks of passed candidates is $35$ and that of the failed candidates is $10,$ what is the number of candidates who passed the examination?

A

$60$

B

$70$

C

$80$

D

$90$

Solution

$4: 1=5$ unit

$5$ unit $=100$

$1$ unit $=20$

Pass candidates $=4$ unit $=4 \times 20=80$

Standard 13

Quantitative Aptitude

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