Thanks for the quick answers. Both suggestions work for me. 

@Massi Thanks for the pointer into the cld-mkiv.pdf 

@Wolfgang: I have to admit that I don't completely comprehend your solution, 
though it
works. Searching around for the commands you use, I came across an older 
posting you
answered too:

https://mailman.ntg.nl/pipermail/ntg-context/2012/064326.html

That helps too. However I can find little documentation on the \setvariable/s 
commands.
I'll play around with the solution to understand it better. 




> \defineexpandable\question{44}

> A solution which uses only existing commands in the document.
> 
> \startsetups [martin]
>      \startlua
>          local points = tonumber(\getvariable{martin}{question}) or 0 ;
>                points = points * 92 ;
>          local answer = 42 ;
>          context.setvariable("martin","points",points) ;
>          context.setvariable("martin","answer",answer) ;
>      \stoplua
> \stopsetups
> 
> \setvariable{martin}{set}{\directsetup{martin}}
> 
> \starttext
> 
> \setvariables [martin] [question=44]
> 
> Points: \getvariable{martin}{points}
> 
> The answer is \getvariable{martin}{answer}.
> 
> \stoptext
> 
> Wolfgang
> 

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