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

[EX Q]: Many Asian countries deny entry to travelers whose passports are valid for less than _ months.
[EX A]: six

[EX Q]: Manatees swim two to _ miles per hour.
[EX A]: six

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