If x⁴ + y⁴ = 17 and x + y = 1, then the value of

?% of (168 ÷ 8 × 20) = 126

20% of 1500 – 75% of 200 = 125% of ? 

Find the value of 16 X [(8 - 5) of 12 ÷ 4].

√196 + (0.25 × 144) + 19 = ? + 7²

22 * 6 + 45% of 90 + 65% of 180 = ?

52% of 400 + √(?) = 60% of 600 - 25% of 400

(25 × 12 + 30 × 8 – 22 × 10) = ?

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

(240% of 175 ÷ √16) X 6 + 80% of 400 = ?³ + 179 + 42

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

(144 × 16 ÷ 12) × 6 = ? 

808 ÷ (128)^1/7 + 482 = 4 × ? + 846