# In an examination, 30% of the total students failed in Hindi, 45% failed in English and 20% failed in both the subjects. Find the percentage of those who passed in both the subjects.   Option 1) 35.7%    Option 2) 35%    Option 3) 40%    Option 4) 45%Option 5) 44%

$n ( A\cup B) = n ( A) + n (B) -n (A\cup B)$
$Total\: students \: failed = (30+45-20)$ %= 55%