Question 947645
1.{{{A=65+(1/2)C}}}
2.{{{B=36+3D}}}
3.{{{C=164+D}}}
4.{{{E=D-137}}}
5.{{{A+B+C+D+E=2680}}}
From 1 and 3,
{{{A=65+(1/2)(164+D)}}}
{{{A=65+82+D/2}}}
{{{A=147+D/2}}}
Substitute this and 2,3,and 4 into 5,
{{{(147+D/2)+(36+3D)+(164+D)+D+(D-137)=2680}}}

{{{(13/2)D+210=2680}}}
{{{(13/2)D=2470}}}
{{{D=380}}}
.
.
So then,
{{{A=147+D/2=147+190=337}}}
{{{B=36+3D=36+3(380)=36+1140=1176}}}
{{{C=164+D=164+380=544}}}
{{{E=D-137=380-137=243}}}