Answer:
2/7
Step-by-step explanation:
Since a week has 7 days and you said 2 days out of 7 it would be 2/7. I like to see the fraction bar as the words "out of" (so 2 out of 7)
(If you were looking for them as 2 different days)
It would be 1/7 because they would each be 1 day out of the 7
