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2014-09-21T10:45:48+03:00
X+y=70
x/2=y/5=k
x=2k
y=5k
2k+5k=70
7k=70
k=10
atunci 
x=20
y=50
2014-09-21T10:47:31+03:00
Direct proportionale x\2=y\5=k
x=2k
y=5k
2k+5k=70
7k=70
k=70\7
k=10
inlocuim k  x=2*10=20    y=5*10=50