A librarian sorts 500 books at a constant rate. After 4 days, the librarian still

8 days.

Step-by-step explanation:

250 is half of 500

So 4 days takes half of the books.

The total would be 8 days because 4 is half of 8.

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First add up the total number of chances.
Which is 12. This is the denominator.

Next find out how many there are of the kind he wants.
He has a chance of getting the two yellow socks out of the 12 total.

So, now you have two out of twelve chances. To put this in fraction form put the total number of chances on top and the number of the thing they want on top.

2/12

Now simplify.
The biggest number that goes into both of them is two. Divide both by two. This will give you 1/6. I hope this helped