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

Q: Weasels reaching _ to six years are regarded as fully mature.

A: five
****
Q: Sociobiology is the historical outgrowth of _ prerequisite trends.

A: three
****
Q: Wheat is roughly _ times as hard to put air through as corn or soybeans.

A:
three
****