TASK DEFINITION: In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.
PROBLEM: Most orangutans are _ to five feet long, some can reach a length of six feet.

SOLUTION: four

PROBLEM: Water is the only substance on earth that exists naturally in _ states .

SOLUTION: three

PROBLEM: Mankind falls into _ groups, when innate nature and inclinations are considered.

SOLUTION:
four