French language Q&A Forum

I already tried submitting this question via the quiz: In a multiple-choice question I was supposed to fill in the answer for Elle est ________ aux jeux de la toupie dans notre groupe, or some such similar question. I got it wrong by selection le meilleur over la meilleur(e) It is not made clear in the the lesson on meilleur vs. mieux why the quiz answer should be la meilleur and not le meilleur. ... After all there may be males in the group considered in the for who is the best at the game."

I have a question which comes from this exercise but is not directly related to the subject matter perhaps but is a listening issue that I have come across before and there must be a rule that I don't know about or that I do and just don't recognise the context: 

In reflexive verb video, which is in the last set of "your practice" offered after you complete the last written section; at 7'40" in the video, the lady says: "Et puis, qu'est qu' on fait quant on utilise l'imperatif..." but instead of saying "quand" she pronounces the "t" as if it were "quante" ...So I wonder if you could tell me what the rule is for pronouncing "quand" with a "t" at the end, since quant, is of course a different word...

I hope that makes sense. I look forward to hearing from you. 

Best regards,

Michael

For the pronunciation of 'finissons' and 'finissez' (or 'choisissons' and 'choisissez'), does the double s sound more like a 's' or 'z'?