A measuring cylinder contains some water. A small metal block is slowly lowered into
the water and is then removed.
Finally a piece of plastic is attached to the metal block and the block is again slowly
lowered into the water.
The diagrams show the measuring cylinder at each stage of this process.
What is the volume of the piece of plastic?
A 10 cm3 B 25 cm3 C 70 cm3 D 80 cm3