Question

Suma a 2 numere este 40 , iar catul lor este 3. Aflati numerele.

Answer 1

a+b=40
a:b=3=>a=3*b
3b+b=40=>4b=40=>b=10
a=3*b=>a=30

Answer 2

$a+b=40\\a:b=3 \to \boxed{a=3b}\\******************\\3b+b=40\\4b=40\\\boxed{b=10} \\ \\ a+10=40\\\boxed{a=30}$