Răspuns :
8 pachete ....... 72 biscuiti
9 pachete ........x biscuiti
x = 72 : 8 x 9 = 81 biscuiti
9 pachete ........x biscuiti
x = 72 : 8 x 9 = 81 biscuiti
8 pachete--------------------------72 biscuiti
9 pachete --------------------------------x
x=72:8x9=81 biscuiti in 9 pechete
9 pachete --------------------------------x
x=72:8x9=81 biscuiti in 9 pechete