probsoln custom numbering of questions

Question

I want to change the numbering of exam questions using probsoln. At the moment it just starts each question directly beneath each other and numbering it as a list. I want it to look something like this:

Question : Vraag 1

Whatever the question may be.

Question : Vraag 2

Another question

etc

Here is the code I have been using, but can't get it to change the numbering at all:

\documentclass[a4paper]{report}
\usepackage{probsoln}

\loadallproblems{prob-easy}
\showanswers

\begin{document}

\begin{enumerate}
  \foreachproblem{\item \thisproblem}
\end{enumerate}


\end{document}
\endinput

Would appreciate any help!

Answer 1

This can be done in a number of ways; first, without additional packages, you can (locally) redefine \labelenumi:

\documentclass[a4paper]{report}
\usepackage{probsoln}

\loadallproblems{prob-easy}
\showanswers

\begin{document}

\begingroup
\renewcommand\labelenumi{\textbf{Question : Vraag \arabic{enumi}}}
\begin{enumerate}
\foreachproblem{\item\thisproblem}
\end{enumerate}
\endgroup

\end{document}

You can also achieve the desired result with the help of the enumitem package:

\documentclass[a4paper]{report}
\usepackage{probsoln}
\usepackage{enumitem}

\loadallproblems{prob-easy}
\showanswers

\begin{document}

\begin{enumerate}[label=\bfseries Question : Vraag \arabic*]
\foreachproblem{\item\thisproblem}
\end{enumerate}

\end{document}

Or, defining a dedicated list:

\documentclass[a4paper]{report}
\usepackage{probsoln}
\usepackage{enumitem}

\newlist{myproblems}{enumerate}{4}
\setlist[myproblems,1]{label=\bfseries Question : Vraag \arabic*}

\loadallproblems{prob-easy}
\showanswers

\begin{document}

\begin{myproblems}
\foreachproblem{\item\thisproblem}
\end{myproblems}

\end{document}

The file prob-easy.tex used in my example:

\begin{defproblem}{cosxsqsinx}%
\begin{onlyproblem}%
$y = \cos(x^2)\sin x$.%
\end{onlyproblem}%
\begin{onlysolution}%
\[\frac{dy}{dx} = -\sin(x^2)2x\sin x + \cos(x^2)\cos x\]
\end{onlysolution}%
\end{defproblem}

\begin{defproblem}{sinxsqsinx}%
\begin{onlyproblem}%
$y = \cos(x^2)\sin x$.%
\end{onlyproblem}%
\begin{onlysolution}%
\[\frac{dy}{dx} = -\sin(x^2)2x\sin x + \cos(x^2)\cos x\]
\end{onlysolution}%
\end{defproblem}

Update

In a comment it has been requested to have the title for each problem centered in a line of its own; here's one possibility:

\documentclass[a4paper]{report}
\usepackage{probsoln}

\newcounter{myprob}
\newenvironment{myproblems}
  {\par\setcounter{myprob}{0}}
  {\par}
\newcommand\MyProb{%
  {\par\medskip\centering\refstepcounter{myprob}\bfseries Question : Vraag \arabic{myprob}\par\nobreak}%
  }

\loadallproblems{prob-easy}
%\showanswers

\begin{document}

\begin{myproblems}
\foreachproblem{\MyProb\thisproblem}
\end{myproblems}

\end{document}

This was prob-easy.tex:

\begin{defproblem}{cosxsqsinx}%
\begin{onlyproblem}%
$y = \cos(x^2)\sin x$.%
\end{onlyproblem}%
\begin{onlysolution}%
\[\frac{dy}{dx} = -\sin(x^2)2x\sin x + \cos(x^2)\cos x\]
\end{onlysolution}%
\end{defproblem}

\begin{defproblem}{texttest}%
\begin{onlyproblem}%
Some text for the example. so the problem will have text and not necessarily a math expression.%
\end{onlyproblem}%
\begin{onlysolution}%
\[\frac{dy}{dx} = -\sin(x^2)2x\sin x + \cos(x^2)\cos x\]
\end{onlysolution}%
\end{defproblem}

\begin{defproblem}{sinxsqsinx}%
\begin{onlyproblem}%
$y = \cos(x^2)\sin x$.%
\end{onlyproblem}%
\begin{onlysolution}%
\[\frac{dy}{dx} = -\sin(x^2)2x\sin x + \cos(x^2)\cos x\]
\end{onlysolution}%
\end{defproblem}