Question 1105512
1.{{{C=12+A}}}
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.
{{{P/A=2/5}}}
{{{2A=5P}}}
2.{{{A=(5/2)P}}}
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3.{{{A=45+P}}}
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Substituting 2 into 3,
{{{(5/2)P=45+P}}}
{{{5P=90+2P}}}
{{{3P=90}}}
{{{P=90/3}}}
Solve for P, then use that results to solve for A and C.