TASK DEFINITION: In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.
PROBLEM: Dingoes live to _ or six years of age in the wild and fifteen years in captivity.

SOLUTION: five

PROBLEM: Birds begin dying of fowl cholera _ to nine days after exposed to the virus.

SOLUTION: four

PROBLEM: Today there are _ billion people in the world.

SOLUTION:
five