What will come in place of (?) in each of the following

$\mathrm{185\; X12} ÷30+66 ÷22= ?$

Solve the following expression.

$11+11\times 11-11÷11$

 By interchanging the given signs which of the following equations will be correct?
$+$ and $\times$ 
 

By interchanging which two signs, the equation will be correct?

$13 - 9 \times 2 ÷ 3 + 16 = 3$

By interchanging which two signs, the equation will be correct?

$5 – 9 + 16 \times 91 ÷ 13 = –98$

After interchanging the given two signs, what will be the value of $11 ÷ 9 - 63 + 7 \times 2$?

$÷ and +$

By interchanging which two signs, the equation will be correct?

$11 + 16 \times 12 ÷ 4 - 2 = 21$

What is the value of:
$2 of 3 ÷ 3 \times 2 + \{4 \times 3 - (5 \times 2 + 3\left)\right\} =?$

What will come at the place of the question mark(?) 

$75$ of $\frac{1}{30}÷\frac{1}{2}=?$