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

Q: Young groundhogs are weaned and ready to seek their own dens at _ to six weeks of age.

A: five
****
Q: Many people spend _ or more hours a day working for someone else.

A: eight
****
Q: Solid lines are the sight-lines to the _ background QSOs.

A:
three
****