Answer:
B. 27.
Step-by-step explanation:
We have been given that a 20-ounce candle is expected to burn for 60 hours. A 12-ounce candle is expected to burn for 36 hours.
We know that a direct proportional equation is in form
, where k represents constant of proportionality.
Let is find value of k by substituting
and
in above equation as:



The equation
represents our given direct proportional relation.
Now, we will substitute
to solve for y as:


Therefore, a 9-ounce candle would be expected to burn for 27 hours and option B is the correct choice.