Optimum temperature for tea cultivation

(20.98 ÷ 2.91) + (15.12 – 5.96) = ? 

(439.98 ÷ 10.99) × 23.98= ? × (23.98) 2 ÷ 47.98

16.22 × 12.99 + 142.15 = ?

15.98% of 2199.9 = √? + 17.02% of 1799.97

(4.89)² + √144.35 - √121.25 = ? 

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

(575.86 ÷ 24.03) × (35.96 ÷ 6.03) + √(255.76) = ?

√2703.88 × √784.15 – 26² = ? - (34.85)²

233.98 + 73 × √35.95 - ? = 275.94 ÷ 3.99

?² - 12.5% of 647.99 = 24.98% × 363.97 + 5% of 1059.98