Answer:
16 days would be taken.
Explanation:
Given that:
6 sheep = 8 cows
1 sheep = (8/6) cows
9 sheep = (8*9)/6 cows
9 sheep = 12 cows
9 sheep + 5 cows = 12 cows + 5 cows
= 17 cows
Now 8 cows can gaze field in 34 days
1 cow can gaze field in (34 * 8) days
17 cows can gaze field in (34*8)/17 days = 16 days
So 9 sheep and 5 cows will take 16 days to graze the field.