Please write your questions in english. Anyway, if google translate got it right, you're looking for two numbers a and b, with ratio 3 and sum -16.
From the information about the ratio, we can deduce
[tex] \frac{a}{b} =3 \implies a = 3b [/tex]
Plug this expression inside the one of the sum to get
[tex] a+b = -16 \implies 3b+b = -16 \implies 4b = -16 \implies b = -4 [/tex]
And since [tex] a = 3b [/tex], we have [tex] a = 3(-4) = -12 [/tex]
