If 'P' means 'multiplied by', 'Q' means 'subtracted by', 'S' means 'added to' and 'R' means 'divided by'. Then which of the following equations would be correct?
1
64 R 8 P 3 S 6 = 72
2
7 S 56 P 2 R 28 = 11
3
36 R 6 P 2 S 4 = 19
4
36 R 9 S 4 P 2 = 14