[tex]3 \ \frac12 kl + 3.5 \: hl - 475 \: l = ...........liter[/tex]

[tex]3 \frac{1}{2} \: kl + 3.5 \: hl - 475 \: l = l \\ \\ \frac{7}{2} + (3.5 \times 100) - 475 \\ \\ ( \frac{7}{2} \times 1.000) + 350 - 475 \\ \\ (7 \times 500) + 350 - 475 \\ \\ 3.500 + 350 - 475 \\ \\ 3.375 \: l[/tex]