TeX Quellcode:

\begin{array}{crclcl} \text{I} & 0{,}06b+0{,}14t &=& 11{,}20 \cr \text{II} & b+t &=& 100 &\vert& -t \cr \cr \text{I} & 0{,}06b+0{,}14t &=& 11{,}20 \cr \text{II} & b &=& 100-t \cr \cr \text{II in I} & 0{,}06 \cdot (100-t)+0{,}14t &=&11{,}20 \cr & 6-0{,}06t+0{,}14t &=& 11{,}20 &\vert& -6 \cr & 0{,}08t &=& 5{,}20 &\vert& : 0{,}08 \cr & t &=& 65 \end{array}