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

[EX Q]: Bilinear interpolation uses a weighted average of the _ nearest pixels.
[EX A]: four

[EX Q]: Gerbils get reproductive when they reach sexual maturity at the age of _ months.
[EX A]: three

[EX Q]: Salts are known in the _ oxidation states.
[EX A]:
three