A box measuring $50 \: cm \times 50 \: cm \times 50 \: cm$ is filled to the top with dry coarse aggregate of mass $187.5 \: kg$. The water absorption and specific gravity of the aggregate are $0.5 \%$ and $2.5,$ respectively. The maximum quantity of water (in kg, round off to $2$ decimal places) required to fill the box completely is __________