1. 

If P denotes '÷', Q denotes 'X', R denotes '+' and S denotes '-', then
18 Q 12 P 4 R 5 S 6 = ?
A. 95
B. 53
C. 51
D. 57

Answer: Option B

Explanation:

Given, 18 Q 12 P 4 R 5 S 6

After changing the letters into signs as per given in the question, we have

18 x 12 ÷ 4 + 5 - 6
= 18 x 12/4 + 5 - 6 [by VBODMAS rule]
= 18 x 3 + 5 -6 = 54 + 5 - 6
= 59 - 6 = 53