Explanation: Potassium (K) is primarily responsible for the development of bolls in cotton.
17% of 250 + ? = 108
(8.4 × 6.5 ×2.52 )/(5.04 ×3.25 ×2.1) = ?
72% of 400 – 23% of 1020 = 120% of ?
150% of ? + 280 ÷ 35 = 132 - 122 + 7
28 × 3.5 +25 × 3.2 = ? - 62
800 + 900 X (3)-2 - ? = 25 X 60 ÷ 2
√? = 80% of 720 - 22% of 2500
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