Question 1043839
{{{N+C=180}}}
{{{T+M=180}}}
{{{N=T}}}
{{{C=M}}}
So then,
{{{12x+10y+5+6x+15y=180}}}
1.{{{18x+25y=175}}}
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2.{{{6x+15y+M=180}}}
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{{{12x+10y+5=6x+15y}}}
3.{{{6x-5y=-5}}}
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4.{{{9x=M}}}
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Multiply eq. 3 by 5 and add to eq. 1,
{{{30x-25y+18x+25y=-25+175}}}
{{{48x=150}}}
{{{x=25/8}}}
So then,
{{{M=6(25/8)}}}
{{{M=125/8}}}