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

[Q]: Calves grow quickly and are weaned from their mothers in only _ to four months.
[A]: three

[Q]: Urushiol oil can be active on any surface for _ years and possibly longer.
[A]: five

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