The visitors of the restaurant were enthralled by the

(32.1)² + (46.8)² - (28.8)² =? + 2257.97

390/? = √256 + 3.5

Evaluate:

7.5 + 12 ÷ (4 × 1.5) − 2.4

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

{12² + (66/4) + (252/8)} ÷ 8 = (?)^1/2

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

30% of 520 + 16% of 1500 = ? + 244

(880 ÷ 11 + 170) X ? = 40% of 1000 

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

2048  ÷  16  +  256  ×  2  −  180

(25)² × 4 ÷ 5 + (3)³ + 48=? + 425

Evaluate:

(24/6) + 3 × (5 - 2)²