Learn Spanish (Spain): Queremos once mesas negras para el restaurante. - We want eleven black tables for the restaurant.

Unlike the number 1 (uno, which changes to un or una), the numbers 11 through 20 do not change their endings based on whether the noun is masculine or feminine. You will use the exact same word for both once mesas (eleven tables) and once libros (eleven books).

Why is there no Spanish word for 'we' before queremos?

In Spanish, the verb ending usually tells you exactly who is doing the action. The -emos ending in queremos already means 'we want', so adding the word nosotros (we) is optional and usually skipped unless you want to add extra emphasis.

Why are the words in the order mesas negras instead of negras mesas?

In Spanish, descriptive words like colors (negras) almost always come after the thing they describe (mesas). Also, notice how negras ends in -as so it perfectly matches the feminine, plural noun mesas.

Why do we use para here to say 'for the restaurant'?

You use para here because the restaurant is the final destination or recipient of the tables. Whenever you are talking about the final destination or purpose of an object, para is the right choice.