What is the maximum number of rectangles in the given

Find the approximate value of Question mark(?). No need to find the exact value.

(18.31)² – (13.68)² + (2344.20 + 82.32) ÷ ? = 229.90

32.12% of 2399.98 + 64.04% of 2499.95 = ? × 15.95

(21.02 × 5.83 × 12.03 ÷ 6.99 of 4.03) + 31.93% of 50.03 = ?

20.22% of (61.9 × 5.01) + 69.97 =? 

29.81 % of 49.91 + 14.28% of 147.09 + 179.91 = ?³

 ?² × 55% of (29 + 32 - 41) = 41.66% of 216 + 9

? = 28.04² ÷ (4.01⁵ + 9.89 × 20.20) + 84.56% of (198.76 × 30.03)

(10.98% of 499.99) - 4.998 = √?