\input{preamble-standalone.ltx}
\begin{document}

% Ex. No. 20 (Section  6.2.1 : Position of the graduations)

\begin{tikzpicture}
\tkzInit[xmax=.5,xstep=0.1]
\tkzDrawX[label=$t$,text=blue,color=red]
\tkzLabelX[text=blue,below = 3pt]
\end{tikzpicture}

\end{document}