## Task 11/61

A door opening of $90 \mathrm{~cm}$ in width is to be nailed shut with boards. Available are boards of suitable length and widths of $8 \mathrm{~cm}$, $10 \mathrm{~cm}$, and $12 \mathrm{~cm}$.

What are the possible combinations if no board is to be cut lengthwise?