Find the missing alphabets in the following series:

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

[60% of 350 + (2/7 of 210)] ÷ 5 = ?

1404 ÷ 26 x 3 + 7 = ?²

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

23 X 35 - ? = (13² + 16) X 3 + 25

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

√441 * 3 + √289 * 4 = ? - √121

26% of 950 + 50/3% of 7962 = ?   

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

? = {1026 ÷ 54 + 17 × 13 – (384 ÷ 24)} 

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

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

? = 12.5% of 25% of 20% of 1280 + 1248

18(1/3) + 9(2/3) – 10(1/3) = 1(2/3) + ?