x-covore de 6m^3
Y-covoarele de 12m^3
x+y=11 => x=11-y
y*12+x*6=84
y*12+( 11-y)6=84
12y+66-6y=84
6y=84-66
6y=18
y=18/6=3
x= 11-3=8
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x-covore de 6m^3
Y-covoarele de 12m^3
x+y=11 => x=11-y
y*12+x*6=84
y*12+( 11-y)6=84
12y+66-6y=84
6y=84-66
6y=18
y=18/6=3
x= 11-3=8