$18.5 \%$ of $220 + 12.4 \%$ of $680 = ?$

The reciprocal of the sum of the reciprocals of $\frac{6}{5}$ and $\frac{3}{7}$ is:

$(21.5 \% \text{ of } 999)^{1/3} + (42 \% \text{ of } 601)^{1/2} + ? = 28$ (Assuming the equation equals $28$ for a standard evaluation)

Which one of the following numbers is divisible by $25$?

$92^{2} - 12^{2} = 3535 + ?$

$72 \%$ of $390 + 28 \%$ of $165 = (x - 3)$