Question 177343
1.{{{A=D+E}}}
2.{{{D/A=0.7}}}
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From 2,
{{{D=0.7*A}}}
Plug that into 1,
1.{{{A=D+E}}}
{{{A=0.7A+E}}}
{{{0.3A=E}}}
Multiply both sides by 10,
{{{3A=10E}}}
{{{A/E=10/3}}}