Question

3 covrigi si 4 paini cantaresc 2,267kg,iar 4 covrigi si 4 paini cantaresc 2,372 kg.O paine,cat cantareste?

Answer 1

3c+4p=2,267, 4p=2,267=3c introducem in ecuatia a doua
4c+4p=2,372, 4c+2,267-3c=2,372, c=2,372-2,267=0,105 kg
4p=2,267-3*0,105=2,267-0,315=1,952
p=1,952/4=0,488 kg

Answer 2

3c+4p=2,267
4c+4p=2,372 si le scadem
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4c-3c =2,372-2,267
c=0,105 kg = 105 g cantareste un covrig
4c+4p=2,372 l :4
c+p=0,593
p=0,593 - 0,105 = 0,488 g.