449.

6:7/9= 6*9/7= 54/7

16:4/11= 16*11/4= 44

13: 26/29= 13* 29/26= 29/2= 14 1/2

7/9:5= 7/9*1/5= 7/45

9/16:6=9/16:1/6= 3/32

1 5/9 : 1 8/27= 14/9 : 35/27= 14/9 * 27/35= 42/35= 1 7/35

2 10/13 : 3 3/26= 36/13*26/81= 72/81

2 4/7 : 1 1/35= 20/7*35/36= 25/9