Question

In an examination, $80\%$ students passed in Mathematics, $72\%$ passed in Science and $13\%$ failed in both the subjects. If $312$ students passed in both the subjects, find the total number of students who appeared in the examination.

Answer 1

$M$	$S$
passed $30$	$72$
failed $20$	$28$

failed in both $=13\%$

$MS$

total failed $=7+13+15=35\%$

Passed $=100-35$

$=65\%$

total NO,. of student passed=?

$=\frac{100}{65}\times 312$

$=480$