I've used a lot of beakers, and they're marked on the side. You just fill it to the line you want to use.
A graduated cylinder
A ruler no a better way is by dropping the cube in a liquid containg beaker displaced liquid will give you the volume
Each producer of laboratory glassware has its own system; these graduations are for volume.
To measure volume
you would use a scale to measure the mass and a beaker to measure the volume. i need another tool
Depending on the size of the object this can be difficult. For a large object, lime a mountain, say, you have no option but to estimate. For smaller objects use a large beaker, and fill it with a liquid in which your shape is not soluble. Measure the volume of liquid in the beaker. Then place the object into the water and make sure it is totally submerged. The volume of the water in the beaker will rise and the volume of the shape is the difference between the two measures.
Beaker
volume.
volume.
The volume of the water in Beaker X will be 100cm3, as you are not adding any more water to the equation (50X+100Y is not 150Y or X, but 50X+100Y) The total volume of matter in Beaker X will be 150cm3, and if the beaker is labelled, the volume measure will indicate 150cm3 due to the displacement of water. But as the answer to your question, the volume of water in Beaker X must be 100cm3 even though visual indicators will not show this due to the displacement of water by marbles
a beaker
To measure volume
Fill the beaker with water, then pour it into a calibrated measuring jug