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2014-03-15T08:18:09+02:00
X/3=y/5=z/9=k
x=3k y=5k z=9k
2y+3x+4z=440
2*5k+3*3k+4*9k=440
55k=440
k=440/55
k=8
x=3*8=24
y=5*8=40
z=9*8=72