(54130-12800:2):30 = 1591
1) 12800 : 2 = 6400
2) 54130 - 6400 = 47730
3)47730 : 30 = 1591
12800:2 6400
54130-6400 47730
47730:30 1591
(54130-12800:2):30 = 1591
1) 12800 : 2 = 6400
2) 54130 - 6400 = 47730
3)47730 : 30 = 1591
12800:2 6400
54130-6400 47730
47730:30 1591