Răspuns :
[tex]a+b=380 \\
a-b=3b \Longrightarrow a=4b \\
4b+b=380 \\
5b=380 \\
\boxed{b=76} \\
a=380-76 \\
\boxed{a=304}[/tex]
[tex]a+b=380\\
a-b=3b=>a=3b+b=>\boxed{a=4b}\\
Inlocuim:\\
4b+b=380\\
5b=380\\
b=380:5\\
\boxed{b=76}\\
a=380-76\\
\boxed{a=304}.[/tex]