In the quiz it marked wrong when I spelled out dix minutes. in the answer it had 10 mins

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Bonjour Louise,
I think your response is correct and this does seem to be a programming miscue.  I am not aware of any grammar rule that requires to use the number (10) in lieu of spelling it out.
Bonne chance.

Ron

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I was marked wrong when I spelled out dix minutes but it was because I misspelled Marseille. That was explained to me when I reported the issue.

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And I wrote dix minuts, forgetting the final e of minutes, It seems to me that mispellings like that and Marseille spelled wrong should be yellow errors, not red.

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There is an error in the answer: "minutes" has somehow been truncated to "mins"

I would like to point out that if the English phrase to be translated spells out "ten" then so should the answer. Also, I was taught in school that the grammer "guideline" (not rule) is that numbers zero through ten should be spelled out in sentences .