Răspuns :
Notam :
n- nr necunoscut
[tex] (\frac{n}{9} *6):3=10\\\\ \frac{2n}{3} * \frac{1}{3} =10\\\\ \frac{2n}{9} =10\\\\ 2n=90\\\\ n= \frac{90}{2}\\\\ \bold{n=45 }[/tex]
n- nr necunoscut
[tex] (\frac{n}{9} *6):3=10\\\\ \frac{2n}{3} * \frac{1}{3} =10\\\\ \frac{2n}{9} =10\\\\ 2n=90\\\\ n= \frac{90}{2}\\\\ \bold{n=45 }[/tex]