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y=alemanes
z=españoles
x+y+z=330
x=y+30
z=2(x+y).............z=2x+2y
sustituimos z=2x+2y en la primera ecuacion
x+y+z=330
x+y+2x+2y=330
3x+3y=330
tambien sabemos que x=y+30:
3x+3y=330
3(y+30)+3y=330
3y+90+3y=330
6y=330-90
6y=240
y=240/6
y=40
si y=40
x=y+30
x=40+30
x=70
x=70 y=40
x+y+z=330
70+40+z=330
110+z=330
z=330-110
z=220
hay 70 franceses
hay 40 alemanes
hay 220 españoles