ANSWER

Step-by-step explanation
First, we have to find the volume of both containers.
The volume of a cylinder is given as:

where r = radius; h = height
The diameters of both containers are given instead of their radii.
Radius is half of the diameter, this means that:

Therefore, the volume of container A is:

And the volume of container B is:

As we can see, the volume of container A is less than the volume of container B.
This means that after the water is pumped completely out of container A into container B, the volume of water in container B is equal to the volume of container A (since container A was filled with water).
Therefore, the volume of water in container B after pumping is:
