Question

50 foot - 8 5/6 foot - 8 5/6 foot

Answer 1

50- 8 5/6  - 8 5/6 
= 50-(8 5/6  +8 5/6)
= 50 - (16 10/6)
= 50 - 17 4/6
= 49 6/6 - 17 4/6
= 32 2/6
= 32 1/3

Answer 2

50 
- 8 5
      6
----------

first you change the 50 to 49 6/6 because 6/6 equals 1 and 49 + 1 = 50 so then your equation becomes:

49 6
      6
-  8 5
      6
---------- 
41 1/6

then subtract 8 and 5/6 from 41 and 1/6 the way I showed you above and your answer should be 32 1/3

hope this helps :)