TASK DEFINITION: In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.
PROBLEM: Pangolins walk on all _ of their stout limbs, which are adapted for digging.

SOLUTION: four

PROBLEM: Black people live about _ fewer years, on average, than white people do.

SOLUTION: six

PROBLEM: Viroids are known to cause disease in at least _ plant groups.

SOLUTION:
six