Suma a trei numere este 2450 . primul numar este cu 250 mai mare decat al doilea si cu 180 mai mare decat al treilea .
care sunt numerele ?

Since you are writing in Romanian, i'll translate first the question.

The sum of three numbers is 2450. The first number is 250 higher than the second and third higher than 180. What are the numbers?

So making the equation.
X + Y + Z = 2450
X = first number
Y = second number
Z = third number

Equation 1.
X = 250 + Y

Equation 2.
X = 180 + Z

Equation 3.
250+Y = 180+Z
Y= Z-70

Equation 4
(Z+180)+(Z-70)+Z = 2450
3Z = 2450 - 110
3Y = 2340

Y = 780
X = 1030
Z = 640

6(2x + 5y)6 (2x) = 12x6 (5y) = 30y12x + 30y

Move the decimal behind it