TASK DEFINITION: In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.
PROBLEM: Unipolar motors have _ coils and are likely to have five or six wires attached.

SOLUTION: four

PROBLEM: Seasons occur because of _ factors working together.

SOLUTION: two

PROBLEM: Most linguists organize the African languages into _ major language families.

SOLUTION:
four