Answer:
The answer is
"She can read 216 words per minute because 72 divided by One-third is equal to 216."
Explanation:
Given the statement
Susan can read 72 words in One-third of a minute ....pause
Whats is one-third of a minute
it is expressed as 1/3*60=20sec
so Susan can read 72 words in 20 second
this means that in a minute she can read
72+72+72 words= 216 word since 20sec*3 is 1 minute
alternatively

we then multiply 73 with the inverse of the denominator
=

=216 words