This is a simple ratio:
weight 128 x
volume 64 27
64x = (128)(27)
x = 54
Note that we cubed 4 and 3 because these are lengths of sides, and the weight varies directly as its VOLUME.
So Im having a hard to remembering how to work this out. Here is the problem:
The weight of a liquid varies directly as its volume V. If the weight of the liquid in a cumbical container 4cm on a side is 128 g, find the weight of the liquid in a cubical container 3cm on a side.