In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.

[Q]: Pups consume an average of _ liters of milk a day .
[A]: eight


[Q]: Walruses walk with _ flippers over ice and snow.
[A]: four


[Q]: Some physicians make the mistake of prescribing a medication for only three or _ weeks.
[A]:
four