Răspuns :
R=in limba romana
S=straine
R+S=4500
S=10% din 4500= 10*45=450carti straine
R=4500-450=4050 carti in limba romana
S=straine
R+S=4500
S=10% din 4500= 10*45=450carti straine
R=4500-450=4050 carti in limba romana
x-carti straine
y-carti lb.romana
x+y=4500
x=4500*(10/100)=45000/100=450
y=4500-450=4050
y-carti lb.romana
x+y=4500
x=4500*(10/100)=45000/100=450
y=4500-450=4050