In Tute, "las 20" or "las 40" can be called when you have 11 & 12 (caballo & rey) of the same suit, STILL IN YOUR hand after you took one trick. 40 is if you have the pair matching the current trump, 20 is for the other suits. Each 20 points are signalled by putting one card (two cards for las 40) upside down on your pile of collected cards perpendicular to the rest of the cards. If you want to call more than one set (e.g. you have more than one pairs of 11 & 12 matching the same suit) you need to take al least one trick for each call. Other players may ask the caller to show their matching cards, but it's considered bad etiquette since everyone should be paying attention and know if one of the cards has already been played.
These points are added to the rest of your hand at the end of the round. Other cards are worth:
- Aces: 11 points
- Threes: 10 points
- Reyes (12s): 4 points
- Caballos (11s): 3 points
- Sotas (10s): 2 points
All other cards have no value.
In Tute Cabrero, the person taking the last trick takes 10 extra points (las 10 de última). Also, if someone manages to take all tricks in a round, it's considered they did Capote and automatically win the game, regardless of current score UNLESS they had also claimed "20" or "40" on that round, in which case they lose.
You can read more details in https://es.wikipedia.org/wiki/Tute and https://es.wikipedia.org/wiki/Tute_cabrero.