How many pairs of letters are there in the word

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

1020 ÷ 51 × 5 + 540 of 25% - 10 = ?² 

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

? X √36 - 184 = 62 X 4

(√ 1444 ÷ 5) × 3.25 = ?

144% of 200 + 11% of 900 + 10% of 20 =?

The value of 11 × 11 + 11 ÷ 11 – 11 × 11 + 11 + 11 × 11 – 11 – 11 × 11 is:

(〖(0.4)〗^(1/3)  × 〖(1/64)〗^(1/4)  × 〖16〗^(1/6)  × 〖(0.256)〗^(2/3))/(〖(0.16)〗^(2/3)  × 4^(-1/2)  ×〖1024〗^(-1/4) ) = ?

(33 + 6.25% of 4096) = ? + 2 × 119

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

√625 + 12 × 5 = ?