In a kitchen there are three containers that can hold different quantities of water, as shown in the figure below:

three containers of the same shape but different sizes are shown, starting with the shortest and ending with the longest. the following quantities are written below the containers. x minus 10 liters below the first, x minus 5 liters below the second, and x liters below the third.

how many liters of water can the three containers hold in all?

x − 15
3x − 15
x3 + 50
3x3 − 15