Negative space enclosed by letterforms is called counters.
Negative space is white space that letters such as O or D have (enclosed white space within the letter). Well, in typography, that white/negative space is called a counter, or aperture, or inner space, or enclosed space.
the answer is 80
you divide 64 by the numerator, 4, which gives you 16, which you then multiply by the denominator, in this case it is 5, 16 x 5 equals 80.
