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

[EX Q]: Black people live about _ fewer years, on average, than white people do.
[EX A]: six

[EX Q]: Eagles attain their adult plumage at _ or five year of age.
[EX A]: four

[EX Q]: Elephants go through _ sets of teeth in a lifetime.
[EX A]:
six