`3/5 + 6/11 + 7/13 + 2/5 + 16/18 +11/5`
`= ( 3/5 + 2/5 + 11/5) + 6/11 + 7/13 + 16/18`
`= 16/5 + 6/11 + 7/13 + 8/9`
`= 176/55 + 30/55 + 7/13 + 8/9`
`= 206/55 + 7/13 + 8/9`
`= 2678/715 + 385/715+ 8/9`
`= 3063/715 + 8/9`
`= 27567/6435 +5720/6435`
`=33287/6435`