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

[EX Q]: R is an average of the color rendering ability of _ or more specific colors.
[EX A]: eight

[EX Q]: American men are _ times more likely to die from prostate cancer than Japanese men.
[EX A]: five

[EX Q]: Odors elicit _ different oscillations in the turtle olfactory bulb.
[EX A]:
three