TASK DEFINITION: In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.
PROBLEM: Scientists use a characteristic to classify animals into _ groups.

SOLUTION: two

PROBLEM: Cockatiels average _ to five eggs per nest, with an egg typically laid every other day.

SOLUTION: four

PROBLEM: Manatees swim two to _ miles per hour.

SOLUTION:
six