dau coroana la primul raspuns

1)15+30 =45 probleme+ex
45 ×4=180
al doilea mod
15×4 =60 probleme
30×4=120 ex
60+120=180
2)12 +15 =27 cutii
27×12= 324
al doilea mod
12×12 =144 prima zi
12×15=180 a doua zi
144+180=324