A large, rectangular container is floating in the ocean with $\backslash (1/4\backslash )$ of its total volume submerged beneath the surface. The container has a mass $\backslash ($ m $\backslash )$ and a total volume $\backslash ($ V $\backslash ).$ In terms of given variables, what mass of sand would have to be poured inside the container so that it floated with $\backslash (3/4\backslash )$ of its total volume submerged instead? Assume this can be accomplished with a quantity of sand that fits entirely inside the container.

$\backslash [$

m$\_\{\backslash$text $\{$sand $\}\}=\backslash$boxed$\{\backslash$frac$\{1\}\{2\}\}$

$\backslash ]$