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

[EX Q]: Diarrhea is an illness that kills _ and one-half million children per year.
[EX A]: three

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

[EX Q]: Females are about _ times more likely than men to develop osteoporosis.
[EX A]:
four