Question 1085507
{{{C=10}}}
{{{D=2C+P=2(10)+P=20+P}}}
{{{450C+110P+45D=11600}}}
Substituting,
{{{450(10)+110P+45(20+P)=11600}}}
{{{4500+110P+900+45P=11600}}}
{{{155P=6200}}}
Solve for P then use the other equations to solve for D.