Answer:
A
Explanation:
When finding out which number is the greatest, I would convert these numbers to numerals with decimals for easier comparison. 
3
 is approximately 6.71.
 is approximately 6.71. 
6
 is 6.25
 is 6.25 
6.55 is, well 6.55. 
From here, we can tell that 6.71 is the greatest, followed by 6.55 and 6.25 is the smallest. Thus, the order in descending order should be 3
 , 6.55 then 6
, 6.55 then 6
 , which is Option A.
, which is Option A.