A. 7 B. 10 C. 15 D. 49 Explanation:Advertisement [3/7 of {21 * (33.33% of (27 + 3) ÷ 5) – 7} – 8] = ? = [3/7 of {21 * (1/3 * 30 ÷ 5) – 7} – 8] = ? = 3/7 of [{21 * 2 – 7} – 8] = ? => {3/7 * 35 – 8} = ? => 7 Advertisement