Question

One seventh of the candidates of an examination were girls and the rest were boys. 20%of the boys and 15%of the girls failed. If the number of candidates be 2800, find the percentage of successful candidates.​

Answer 1

Step-by-step explanation:

let

the number of failed boys=x

number of failed girls=1/7x

now

number of girls failed=15%

number of boys failed=20%

number of students failed=35%

total number of students passed=100-35=65%

here given

total number of students=2800

so,

number of passed students=65/100*2800

=1820

number of failed students=35/100*2800

=980

$now \\ number \: of \: failed \: girls \\ = > \frac{980}{7} = 140 \\ number \: of \: failed \: boys \\ = > 980 - 140 = 840$

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