METODA COMPARATIEI
3 c..........4 p...............2300 gr. / x 7
7 c..........7 p................4200 gr. / x 3
21 c...........28 p...........16100 gr.
21c............21 p ...........12600 gr.
% 7 p...........3500 gr.
1 p = 3500 gr : 7 = 500 gr.
3 c.............4 p x 500 gr.........2300 gr.
3 c..............2000 gr.............2300 gr.
3 c = 2300 - 2000 gr.
3 c = 300 gr.
1 c = 300 gr: 3 = 100 gr.