\newproblem{
\FPsetpar{a}{2}{5}
\FPsetpar{b}{3}{5}
%\FPsetpar{c}{\a}{8}
\item \PTs{1} 
  $a=\a$, $b=\b$%, $c=\c$

Evaluate $\a+\b=$\fillin{1cm}{$\FPsv{a+b}$}
 }

\newproblem{
\FPsetpar{a}{12}{15}
\FPsetpar{b}{13}{15}
\FPsetpar{c}{2}{4}
\FPsetpar{k}{4}{5}
\item \PTs{1}
  $a=\a$, $b=\b$, $c=\c$, $k=\k$

Evaluate   with two exact decimals 

$ \b:\k$=\fillin[u]{1cm}{$\FPsv[2]{b/k}$}
 }
