Răspuns:
[tex]m+n = 60 \\\\\frac{m}{n} = 3 =>m = 3n\\\\3n + n = 60\\\\4n = 60 \\\\n = 60 : 4 \\\\\boxed{n =15}\\\\m + 15 = 60 \Rightarrow m = 60 -15 \Rightarrow \boxed{m =45 }[/tex]
