6,4 : 3 1/5 : (4+ 1 5/8)

1)6,4: 3 1/5=2
2)4+1 5/8=5 5/8
3)2:5 5/8= 16/45

6,4 : 3 1/5 : (4 + 1 5/8) = 16/45
1) 4 + 1 5/8 = 5 5/8
2) 6,4 : 3 1/5 = 64/10 : 16/5 = 64/10 * 5/16 = 4/2 = 2
3) 2 : 5 5/8 = 2 : 45/8 = 2 * 8/45 = 16/45