Răspuns :
[tex]18\%+32\%+1760~volume=100\% \\ 50\%+1760~volume =100\% \\ 1760 ~volume = 100\% -50\% \\ 1760 ~volume = 50\% \\ =\ \textgreater \ Biblioteca avea: ~~2 \times 1760 = \boxed{3520 ~volume} [/tex]
18[la suta]+1760=100-32=68[la suta];
⇒50/100 ·x=1760
⇒x=1760/50/100=1760·100/50=1760·2=3520[volume are biblioteca];
⇒50/100 ·x=1760
⇒x=1760/50/100=1760·100/50=1760·2=3520[volume are biblioteca];