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

[EX Q]: Young groundhogs are weaned and ready to seek their own dens at _ to six weeks of age.
[EX A]: five

[EX Q]: Soft money is the unlimited, unregulated money that has _ business influencing politics.
[EX A]: no

[EX Q]: Plasma levels fall by about a half within three to _ hours.
[EX A]:
four