Question

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?

Answer 1

@triciaal

Answer 2

Since you need a total, that suggests addition.
Add the three amounts.