Plan
1) Cate baloane verzi au folosit ?
12 - 4 = 8 baloane verzi
2) Cate baloane rosii s-au folosit ?
8 + 10 = 18 baloane rosii
3) Cate baloane galbene s-au folosit ?
18 : 3 = 6 baloane galbene
Rezolvarea problemei printr-un exercitiu
( 12 - 4 + 10 ) : 3 = ( 8 + 10 ) : 3 = 18 : 3 = 6 baloane galbene