If 'p' means '×', 'q' means '-', 'r' means '÷' and 's' means '+', then which of the following equation is NOT correct?
I. 44 s 51 r 17 q 20 p 4 = -31
II. 57 r 19 s 5 p 10 q 18 = 35

Putting given values: New equation
44 + 51 ​÷ 17 - 20 ​× 4 = -31
​44 + 3 - 20 ​× 4= -31
​44 + 3 - 80 = -31​
47 - 80= -31
-33 = -31 (Not follows)
II. 57 r 19 s 5 p 10q18 = 35
Putting given values: New equation
57 ÷ 19 + 5 × 10 - 18 = 35
3 + 5 × 10 - 18 = 35
​3 + 50 - 18 = 35
53 - 18 = 35
35 = 35 (Follows)
So, only II is not correct.
Thus, correct option is (d).