Hello Hels,

It might be a good idea to try and understand why you can't calculate the volume of the 600 ml bottle while you can calculate the volume of the 1L one. Your technique should apply to both cases; if it doesn't then you don't have the right technique.

An dimensional object, if it is expanded to times its original size, will have times its original volume. For instance a circle that is twice the radius of another circle will have four times the area; a ball will have eight times the volume of a ball of half its radius.