Multiple choice If P denotes +, Q denotes -, R denotes ÷ and S denotes x, then 18 S 36 R 12 Q 6 P 7 = 115 25 55 648/13 Reveal answer Fill a bubble to check yourself C Correct answer Explanation 18 S 36 R 12 Q 6 P 7 = ? = 18 x 36 ÷ 12 - 6 + 7 = 18 x 3 - 6 + 7 = 54 + 1 = 55