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2014-10-12T18:05:25+03:00
3a +2(b+2c) =494 
3a+2x160=494
3a +320=494
3a=494 -320
3a=174
a=174:3
a=58

ab+2ac=a(b+2c) =3x160 =480
4 3 4
2014-10-12T18:09:38+03:00
In 3a+2b+4c=494              o sa scadem
            b+2c=160  
---------------------------
3a+b+2c=494-160
3a+b+2c=334
3a+160=334
3a=174
a=58

ab+2ac=
58*b+2*58*c=
58*b+58*2c=
58(b+2c)=
58*160=
9280

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