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

[Q]: Plants are _ feet apart with ten feet between rows.
[A]: four


[Q]: Women are _ times as likely to develop osteoporosis but men can also develop it.
[A]: four


[Q]: Females give birth every _ to twenty years, and care for the calves for more than a decade.
[A]:
four