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

[EX Q]: Most orangutans are _ to five feet long, some can reach a length of six feet.
[EX A]: four

[EX Q]: Tin exists in _ allotropic forms.
[EX A]: three

[EX Q]: Digestive warmth is the key to the success of the entire process of keeping _ humors in balance.
[EX A]:
three