Answer:
The fraction of smoothies sold were either banana or strawberry is 
Step-by-step explanation:
Given:
Of the smoothies sold yesterday at Marlins smoothie shop, 5/6 were banana and another 1/12 were strawberry.
Now, to find the fraction of the smoothies sold were either banana or strawberry.
Fraction of smoothie were of banana = 
Fraction of smoothie were of strawberry = 
Now, to get the fraction smoothies sold were either banana or strawberry by adding both the fractions of banana and strawberry:

Therefore, the fraction of smoothies sold were either banana or strawberry is 