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

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

[EX Q]: Poverty kills a child every _ seconds.
[EX A]: three

[EX Q]: Octopuses have _ arms, which are extended from the mantle.
[EX A]:
eight