What should come next in the following letter series based on English alphabet ?
$CEA IKG OQM ?$

In a certain code language, $JANUARY$ is written as $ZSBTOBK.$ How is $OCTOBER$ written in that code language?

What will come in the place of the question mark (?) in the following question?

$\frac{3}{9}\times 2268+\frac{2}{11}\times 1397=?$

What will come in the place of the question mark (?) in the following question?

$7802+132-8963+1326=?\times 33$

What will come in the place of the question mark (?) in the following question?

$21.9\%$ of $650=?+23.12$

What will come in the place of the question mark (?) in the following question?

$6666÷66÷0.25=?$

What will come in the place of the question mark (?) in the following question?

$\sqrt{?}+18=\sqrt{2704}$