b1+b2=830dal (apă )b1=b2-130dal

Răspuns :

b1+b2=830dal
b1=b2-130dal

Dupa inlocuiesti in prima
b2-130+b2=830
b2+b2=830+130
2b2 =960
b2=960:2
b2=480dal
si b1=480-130= 350dal