Răspuns:
a+b+c=390
c=b+25
a=c+40=b+25+40=b+65
S=b+65+b+b+25=390
3b=390-90=300
b=100
a=100+65=165
c=100+25=125
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Răspuns:
a+b+c=390
c=b+25
a=c+40=b+25+40=b+65
S=b+65+b+b+25=390
3b=390-90=300
b=100
a=100+65=165
c=100+25=125