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

[EX Q]: Economic equilibrium occurs where the _ lines intersect.
[EX A]: two

[EX Q]: Sugar Gliders live between _ and fifteen years.
[EX A]: eight

[EX Q]: Cats begin to show visible age-related changes at about _ to twelve years of age.
[EX A]:
seven