Răspuns :
La 20 se rotunjesc numerele 16,17,18,19,21,22,23,24, iar la 30 se rotunjesc numerele 26,27,28,29,31,32,33,34.
La 20- 15, 16, 17,18,19,20,21,22,23,24. La 30- 26, 27,28,29,30,31,32,33,34. Sper ca te-am ajutat!