An example of a telecommunication device is a _____.

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

$849 + 555 = ? \times 18$ 

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

$123 ÷ 6 ÷ 0.8 = ?$

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

$43\% of 583 - ?\% of 401 = 158.46$

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

$50085 ÷ \sqrt{?} =53 \times 15$

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

$69.2 \times 18.4 \times 4.5 = ?$

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

$52\% of 666 + ? = 500$

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

$101.5 \times ? = 1421$