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Cel mai inteligent răspuns!
2014-04-22T18:23:12+03:00
X+y+z=420
x,y,z  ip   cu 2,5,6
2x=5y=6z=k
x=k/2
y=k/5
z=k/6

k/2+ k/5+ k/6= 420  aducem la acelasi numitor
15k+6k+5k=12600
26k=12600
k=6300/13

x=2* 6300/13=12600/13
y=5*6300/13=31500/13
z=6*6300/13=37800/13
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