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

[EX Q]: Cortisone drops only every hours _ instead of one.
[EX A]: two

[EX Q]: Southern moles are six to seven inches long and weigh _ to four ounces.
[EX A]: three

[EX Q]: Stairs account for three times more injuries to children under age _ than do toys.
[EX A]:
five