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.

$n ( A\cup B) = n ( A) + n (B) -n (A\cup B)$

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

Passed out = 45%

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