(17 : 3 2/5 - 6 3/8 : 3 3/8) : (1 1/5 - 29/30) = 13 1/3
1) 17 : 3 2/5 = 17/1 : 17/5 = 17/1 * 5/17 = 5/1 = 5
2) 6 3/8 : 3 3/8 = 51/8 : 27/8 = 51/8 * 8/27 = 51/27 = 1 24/27
3) 5 - 1 24/27 = 4 27/27 - 1 24/27 = 3 3/27 = 3 1/9
4) 1 1/5 - 29/30 = 6/5 - 29/30 = 36/30 - 29/30 = 7/30
5) 3 1/9 : 7/30 = 28/9 : 7/30 = 28/9 * 30/7 = 120/9 = 13 3/9 = 13 1/3