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

[EX Q]: Most children recover from croup in _ to five days.
[EX A]: three

[EX Q]: Corms are undifferentiated, uniform, and contain _ rings when cut apart.
[EX A]: no

[EX Q]: Malignant pulses are of _ types.
[EX A]:
three