LaTeX Forum

\documentclass[12pt,a4paper,oneside,DIV=12,parskip]{scrartcl}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{amsmath}
\usepackage{tabu}
\usepackage{longtable}

\begin{document}

\tabulinesep = 2,5mm
\begin{longtabu} to \textwidth {X[0.5,l]X[6,l]|X[1,r]}
\multicolumn{2}{l|}{\textbf{Aufgabe 3}}&\\
a) & \parbox[tt]{0.65\textwidth}{Bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla:}&\\
{}&\begin{tabu} to 5cm {|X[m]|X[m]|}
  \hline
  Abc & 20 \% \\
  \hline
  Def & $\dfrac{1}{4}$ \\
  \hline
  Ghi & 16 Jkl \\
  \hline
\end{tabu}&\\
{}&\parbox[b]{0.65\textwidth}{Bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla?}&\rule[-1mm]{0,5cm}{1pt}\ / 2 P\\
\end{longtabu}

\end{document}