[tex]\text{Notam numerele cu a si b.}\\
b=3\frac{1}{5}\cdot a\Rightarrow b=\frac{16}{5}\cdot a\\
a+b=84\\
a+\frac{16}{5}\cdot a=84|\cdot 5\\
5a+16a=420\\
21a=420\Rightarrow \boxed{a=20}\\
b=\frac{16}{5}\cdot a\\
b=\frac{16}{5}\cdot 20\Rightarrow \boxed{b=64}\\
\text{R:Numerele cautate sunt 20 si 64.}[/tex]
