Four letter-clusters have been given out of which three

?= √(4 × ∛(16 × √(4 × ∛(16 ×…… ∝)) ) ) 

6 × 1.8 × 0.25 × 70 = ? + 9.5

(? × 3)² - 85 = 115 × 5 + 69

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

(√576 * 35 ÷7) * 20% of ? = 72

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

? = 90% of 25% of (40 × 200) + 300

Determine the value of ‘x’ if x% of 500 plus {1250 ÷ x of 10} × 5 equals 130

21% of 400 − 150 = ? − 77

9 × 4⁰ × 24² × 18² = ?²

Find the value of (x + y)² - (x - y)², where x = 15 and y = 7.

(125 × 12 × √8100) ÷ 150 = ?