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

[EX Q]: Most people breathe so poorly that they average between _ and thirty breaths a minute.
[EX A]: ten

[EX Q]: Most turbines have either _ or three blades.
[EX A]: two

[EX Q]: Roots can grow deep in _ years.
[EX A]:
six