Răspuns :
x,y,z => x=180 => y=x + 140 =180 +140 =320 => z=x+y=180 + 320 =500 => x+y+z =180 + 320 + 500=1000.
a = 180
b=a+140=180+140=320
b = 320
c=a+b=180+320=500
c = 500
a+b+c=180+320+500=1000
b=a+140=180+140=320
b = 320
c=a+b=180+320=500
c = 500
a+b+c=180+320+500=1000