1)3 15/28 : 9/28 = 73*28/9*28 = 73*1/9 = 73/9 = 8 1/9
2)1 : 1 10/49 = 1 : 59/49 = 49/59
3)8 1/9 - 49/59 = 4307-441/531 = 3866/531
4)2/5 * 3866/531 = 7732/2655
5)7732/2655 : 2 = 7732/2655 * 1/2 = 3866/2655
6)21 2/59 - 3866/2655 = 55845 - 3866/2655 = 51979/2655 = 881/45 = 19 26/45