"The old bear eats tasty meat."
Translation:Stary niedźwiedź je smaczne mięso.
Firstly, of course, VarHyid is right, technically there's nothing in the original sentence to mean "ten", as there's only "the".
However, while I personally don't love it, we do usually accept "ten" for "the" in such contexts. So I am going to add it. But please take a note that such usage is a bit of an interpretation, and it does in fact mean "this".