Question

3 cornuri.....5 paini....2300 g. 4 cornuri.......2 paini ......1200g. /METODA COMPARATIEI

Answer 1

3 cornuri.........5 paini.............2.300g  lx4
4 cornuri.........2 paini.............1200g   lx3

12 cornuri......20 paini...........9.200 g
12 cornuri......6 paini.............3.600 g


20-6=14 paini
9.200-3.600=5.600 (cate grame are 14 paini)

5.600:14=400 g ( are o paine)

2x400=800 g (2 paini)
1200-800=400g (4 cornuri)

400:4=100 g (un corn)

Answer 2

Inmultim cu 4 cantitatile primului rind si cu 3 cantitatile rindului 2, obtinem: 
12 c       20 p    9200g
12 c        6  p     3600g
20p-6p=14p cintaresc 9200g-3600g=5600g
1p cintareste 5600:14=400g
6p o sa cintareasca: 6*400=2400g
12 c o sa cintareasca 3600-2400=1200 g
1c o sa cintareasca 1200:12=100 g

Raspuns: 1c     100g
                 1p    400g