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

[EX Q]: Screws provide at least _ times the holding power of nails.
[EX A]: seven

[EX Q]: Humans begin laughing at _ to three months of age.
[EX A]: two

[EX Q]: Saddle sores are a common problem after spending six and _ hours in the sweat and heat.
[EX A]:
seven