21.a) Kafejnīcā ir attēlā redzamā ēdienkarte. Apmeklētājs grib izvēlēties zupu un otro ēdienu ar piedevām. Cik dažādus pusdienu komplektus var izveidot?

Let's break down the problem:

1. Soups: There are 3 types of soups: Aukstā zupa, Piena zupa, Solanka
2. Main Courses: There are 5 types of main courses: Kotlete, Vistas fileja, Zivs fileja, Karbonāde, Zivs kotlete
3. Sides: There are 2 types of sides: Vārīti kartupeļi, Risi

The customer wants to choose one soup, one main course, and one side.

To find the total number of different lunch sets, we need to multiply the number of options in each category:

$$3 \text{ soups} \times 5 \text{ main courses} \times 2 \text{ sides} = 30$$

So there are 30 different lunch sets that can be created.

Answer: 30