Răspuns :
c=96-(a+b)=96-53=43 carti al3lea raft
a=96-(b+c)=96-61=35 carti primul raft
b=96-(a+c)=96-78=18 carti al2lea raft
a=96-(b+c)=96-61=35 carti primul raft
b=96-(a+c)=96-78=18 carti al2lea raft
[tex]a+b+c=96 \\ \\ a+b=53 \\ \\ b+c=61 \\ \\ c=96-53=43 \\ \\ a=96-61=35 \\ \\ b=53-35=18[/tex]