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2014-11-18T16:17:07+02:00
A+b+c =170
a:b=1/2  => a=b:2
c-b=20 => c=b+20
inlocuim
b:2+b+b+20 =170
2b+b:2=150 aducem la numitor comun
4b+b=300
5b=300
b=300:5=60
c=60+20=80
a=60:2=30

proba
a+b+c=30+60+80=170 adevarat
c-b=80-60=20  adevarat ( cum ne spune problema )

Succes !!
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