Which of the following is the prominent dual purpose

(2 ÷ 3) × (4 ÷ 12) × (? ÷ 10) × 45 × (1 ÷ 5) = (? ÷ 6) + (2 ÷ 5)

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

{(4800 ÷ 25 of 16) × 40 + 320} = ? % of 1600

40% of (34 x 25) + 105 = ?

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

(1/5)(40% of 800 – 120) = ? × 5

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

133 ÷ 19 X √576 + ? ÷ 2 = 32 X 7.5

(512) ^(2/3) × √64 ÷ (512) ^(1/3) = (64) ^(?/2) ÷ (2)⁶ 

8⁹ ÷ 512 × (1/64) = (2³)^?

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

?% of 2480 + 15 × 34 = 1440