Reenumerate exercises

Question

I want to re-number the exercises below by changing the number 1. by 9., the number 2. by 12. and the number 3. by 15. How should I proceed?

\documentclass{article}

\usepackage[brazil]{babel}
\usepackage[utf8]{inputenc}
%\UseRawInputEncoding
\usepackage[T1]{fontenc}
\usepackage{Sweave}
\usepackage[fixlanguage]{babelbib}
%\usepackage[pdftex]{color}
\usepackage{dsfont}
\usepackage{esvect}
\usepackage[labelfont=bf]{caption}
\usepackage{float}
\usepackage{tasks}
\usepackage{color, colortbl}
\usepackage{xcolor}
\colorlet{lightcyan}{cyan!40!white}
\usepackage{chngcntr}
\usepackage{stackengine}
\usepackage{ragged2e}%para justificar o texto dentro de algum ambiente
\definecolor{Gray}{gray}{0.9}
\definecolor{LightCyan}{rgb}{0.88,1,1}

\newlength{\longestlabel}
\settowidth{\longestlabel}{\bfseries viii.}

\setcounter{secnumdepth}{0} \setlength{\topmargin}{0cm}
\setlength{\headsep}{-0.3cm} \setlength{\textwidth}{17.5cm}
\setlength{\textheight}{23cm} \setlength{\oddsidemargin}{-0.8cm}
\setlength{\evensidemargin}{0cm} \setlength{\footskip}{-1.5cm}

\usepackage[lastexercise,answerdelayed]{exercise}
\renewcommand{\ExerciseName}{Exercícios}
\renewcommand{\ExerciseHeader}{\noindent\def\stackalignment{l}% code from https://tex.stackexchange.com/a/195118/101651
    \stackunder[0pt]{\colorbox{cyan}{\textcolor{white}{\textbf{\large\ExerciseName}}}}{\textcolor{lightcyan}{\rule{\linewidth}{2pt}}}\medskip}

\begin{document}



\vspace*{-2cm}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\medskip

\begin{center}

\underline{\underline{{\large{\sc Soluções da Lista}}}}

\bigskip

{\large {\bf Prof. xxxxxx}}
%\bigskip
%
%%{\sc Data: $19/06/2018$}
\end{center}

\begin{Exercise}

\Question O fabricante de certa...

\Question A duração das lâmpadas produzidas por...

\Question O custo de produção de certo artigo...

\end{Exercise}

\end{document}

...start by creating a much smaller example that replicates your current behaviour. See I've just been asked to write a minimal example, what is that? — Werner, Aug 27 '18 at 18:46
For your example, do you need ragged2e, chngcntr, xcolor, caption, stackengine, ...? Not really. You can reduce the content to just use what you need, which is exercise. — Werner, Aug 27 '18 at 18:55
Unrelated, but don't use two letter font commands: \bf, \it, \sc etc. They have been deprecated for decades. See Will two-letter font style commands (\bf , \it , …) ever be resurrected in LaTeX?. — Alan Munn, Aug 27 '18 at 21:42

score 2 · Accepted Answer · answered Aug 27 '18 at 18:50

You can create the own ManualExercise enviroment:

\documentclass{article}

\usepackage[lastexercise,answerdelayed]{exercise}
\renewcommand{\ExerciseName}{Exercises}
\renewcommand{\ExerciseHeader}{Exercises}

% Partial code taken from http://mirrors.ctan.org/macros/latex/contrib/exercise/exercise.dtx
\newenvironment{ManualExercise}
  {\begin{list}{}{\leftmargin \QuestionIndent
    \partopsep0pt \parsep\parskip \topsep\QuestionBefore
    \itemsep\QuestionBefore \labelwidth2em
    \labelsep.33em
    \usecounter{Question}}}
  {\end{list}}

\begin{document}

\begin{Exercise}
  \Question Lorem ipsum \ldots
  \Question Lorem ipsum \ldots
  \Question Lorem ipsum \ldots
\end{Exercise}

\begin{Exercise}
  \begin{ManualExercise}
    \item[9.~] Lorem ipsum \ldots
    \item[12.~] Lorem ipsum \ldots
    \item[15.~] Lorem ipsum \ldots
  \end{ManualExercise}
\end{Exercise}

\end{document}

The reason for this is that the Exercise environment created by exercise sets up a regular list but checks whether it's the first \Question or a subsequent \Question in the list. Based on this conditioning, it's far easier to create your own rather than update the list to accommodate your requirement.

The list parameters is the same as that of the Exercise environment, taken from exercise.dtx.

Reenumerate exercises

1 Answers1