Answer: 9 sweets/friend
Step-by-step explanation:
s = Number of sweets per friend
n = Number of sweets in a box = 54
f = Number of friends = 6
formula for the number of sweets each friend gets is as follows:
                n/f = s
Therefore substituting in formula for n=54 and f=6
                 54/6 = 9 sweets per friend