Question: Using Grading:-Quiz

Two questions. 

1/ Can we modify the output look of the Quiz question?  (ie change the size of the table that is created - make it smaller?)

2/ How to make an algorithmic question ie. for adding two different numbers using the Quiz command?  What I mean here is to randomly change the numbers each time.

I was trying something like

Quiz("What is ", a+b, proc () local a, b: a := rand(1 .. 20)(): b := rand(1 .. 20)(): end)

But the values don't get passed to a and b so the answer will only be a+b.  Any way to get values passed to the variables?

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