Answer:
It'll be an engine with six 500cc cylinders, which give 3.0.
Explanation:
Notice that the number 2.0 describes the numbers of cylinders and their capacity. That is, 4 cylinders with 500cc each, gives a total of 2000, which is equivalent to 2.0 engine.
Having said that, if we add two more 500cc cylinders, the engine would be 3000, which is equivalent to 3.0.