To find the total amount of water, \( w \), that Martina used, we can multiply the amount of water in each container by the number of containers.
Since she has 8.5 ounces of water in each of the 5 containers, the equation can be modeled as:
\[ w / [5] = [8.5] \]
This means \( w \) (the total amount of water) is equal to the amount of water per container (8.5 ounces) multiplied by the number of containers (5).
You can express the total amount of water as:
\[ w = 8.5 \times 5 \]
So if you were to fill in the brackets correctly:
\[ w / [5] = [8.5] \]
or alternatively,
\[ w = 8.5 \cdot 5 \]