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Trei covrigi si 4 paini cantaresc 2300g,iar 7 covrigi si 7 paini cantaresc 4200g,un covrig cantareste?AJUTOR

Răspuns :

3c+4p=2300
7c+7p=4200
deci
c+p=4200/7=600
c=600-p
3x(600-p)+4p=2300
1800-3p+4p=2300
p=2300-1800
p=500 g
c+p=600  c=600-500
c=100 g