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

[EX Q]: Catholic systems comprise _ of the twenty largest healthcare systems in the country.
[EX A]: ten

[EX Q]: Transitional milk is secreted between about four days and _ days postpartum.
[EX A]: ten

[EX Q]: Collaborative commerce is the extension of core business processes beyond a company's _ walls.
[EX A]:
four