TASK DEFINITION: In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.
PROBLEM: Most people see the world through _ types of visual-receptor cells.

SOLUTION: four

PROBLEM: Woodchucks can dig up to _ entrances to one den.

SOLUTION: three

PROBLEM: Nymphs feed for five to _ weeks before entering the adult stage.

SOLUTION:
eight