Translation:How many men?
I wrote exactly the same answer as duolingo and was told it was wrong. Makes no sense.
Restlessbit, If I wanted to answer you in a similar way, I might say, "You ain't wrong, bro!" ;-)
But no, it is not Duo's intent to lend respect to, nor to "mainstream" local colloquialisms or slang. We may talk that way in very casual circumstances, but as adults, we need to know proper speech for dealing with the educated world. "Jus' sayin'..."