TASK DEFINITION: Given a sentence, fill out the missing word with a 'no' or a number (between zero and ten). You should write the numbers with english alphabet, like: four instead of 4.
PROBLEM: All orthodontists are dentists, but only about ____ percent of dentists are orthodontists.

SOLUTION: six

PROBLEM: Orangutans spend up to ____ hours a day eating or foraging for food.

SOLUTION: six

PROBLEM: Melanocytes are dendritic and are distributed roughly ____ per six basal cells.

SOLUTION:
one