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2014-06-02T11:24:55+03:00
A+b=76
b+c=68
a+c=83
adunam cele trei relatii
2a+2b+2c=227  I:2
a+b+c=113.5
a+68=113.5
a=113.5-68=45.5 kg are primul elev
c=83-a=83-45.5=37.5 kg are al doilea elev
b=68-c=30.5 kg are al treilea elev
5 3 5