Hi,

I am new to this forum but I was just wondering If I can get some answers for my maths assignment which I am really struggling with. For my assignment I have to design three water bottles with the volumes of 1L, 600mL and 300mL. The bottles all have to be the same shape with the same proportion. The bottles need to have at least three different functions. I have my 1L bottle designed with all the curves. I used the volume of revolution to determine the 1L volume of the bottle. But, I am having trouble with finding the 600mL and 300mL and their functions being in the same ratio with the 1L. I was just wondering is there any rule that will help me find the volumes and have the same ratio as the 1L bottle i designed.

Any help would be appreciated

Thanks heaps