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Cel mai inteligent răspuns!
2014-10-11T10:50:32+03:00
Notam a,b,c cele 3 nr 
a+b+c=980
a=3b

2a=c
c=6b

a+b+c=980
3b+b+6b=980
10b=980
b=98

a=294
c=588
Mersi frumos.. Se chinuia sor-mea de 2 zile la problema asta :)).
2014-10-11T11:51:03+03:00
X+y+z=980
x=3y
z=2x=2*3y=6y

3y+y+6y=980
10y=980
y=98
x=3*98=294
y=6*98=588