Which of the following are physical contaminants

(22 + √3364)/(? + 4) = 10

28(4/5) + 52(1/2) × 8(2/7) - 11(1/5) = ? + 6(1/5)

(8.6 × 8.6 + 4.8 × 4.8 + 17.2 × 4.8) ÷ (8.6² – 4.8² ) = ? ÷ 19

The value of 42 ÷ 9 of 6 - [64 ÷   48 x 3 – 15 ÷ 8 x (11 – 17) ÷ 9] ÷ 14 is:

(21 × 51 + 81)/(9 × 14 - 30) = ?

 {(481  + 426) 2 - 4 × 481 × 426} = ?

?% of (168 ÷ 8 × 20) = 126

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

? = (27 × 13) – 26% of (41² – 9² )

82% of 400 + √(?) = 130% of 600 - 85% of 400