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

Q: Some women experience a labor of three to _ days.

A: five
****
Q: Calves grow quickly and are weaned from their mothers in only _ to four months.

A: three
****
Q: Color film is sensitized in _ layers to red, green, and blue light.

A:
three
****