$134 \%$ of $3894 + 38.94$ of $134 = ?$

$A$ number is decreased by $10 \%$ and then increased by $10 \%$. The number so obtained is $10$ less than the original number. What was the original number?

In an election between two candidates,$60 \%$ of the voters cast their vote,out of which $4 \%$ of the votes were declared invalid. $A$ candidate received $7344$ votes,which were $75 \%$ of the total valid votes. Find the total number of votes enrolled in the election.

$860\%$ of $50 + 50\%$ of $860 = ?$

In an examination,$5 \%$ of the applicants were found ineligible and $85 \%$ of the eligible candidates belonged to the general category. If $4275$ eligible candidates belonged to other categories,then how many candidates applied for the examination?

If $30 \%$ students failed in English,$45 \%$ failed in Math,and $25 \%$ failed in both,then what is the percentage of students who passed in both subjects (in $\%$)?