x + y +z = 950
x - 25%· x = 75% · x = 75 /100 · x = 3x / 4
y - 40 % ·y = 60%· y = 60y /100 = 6y/10
z - 70%z = 30%·z = 30z /100 =3z /10
3x / 4 = 6y /10 = 3z /10 = k
x = 4k /3
y = 10k / 6 = 5k /3
z = 10k / 3
( 4k + 5k + 10k) / 3 = 950
19k =950 · 3
k = 950 · 3 : 19 = 150
⇒ x = 4 · 150 :3 = 200
y = 5 · 150 :3 = 250
z = 10 · 150 :3 = 500