Răspuns :
4 sacouri.................12 m stofa
9 sacouri..................x m stofa
----------------------------------------------
x=9x12/4=9*3=27
sau
4 sacouri.................12 m stofa
9 sacouri..................x m stofa
1 sacou=12m/4 sacouri=3m
9 sacouri=9*3=27
9 sacouri..................x m stofa
----------------------------------------------
x=9x12/4=9*3=27
sau
4 sacouri.................12 m stofa
9 sacouri..................x m stofa
1 sacou=12m/4 sacouri=3m
9 sacouri=9*3=27