DECODING the given information,ABCDMeans+×÷- 18 + 6 × 2 ÷ 16 × 4 - 21 =? Using BODMAS rule,18 + 6 × 1/ 8 × 4 – 21 = ?18 + 3 – 21 = ?21 – 21 = 0Hence, “0” is the CORRECT answer.