Question 164328
Name your variables.
D-dogwood investment
R-red maple investment

1.{{{D+R=20000}}}
2.{{{0.25*D+0.17*R=0.20*(D+R)}}}
Use eq. 1 to solve for D in terms of R and substitute into eq. 2,
1.{{{D+R=20000}}}
{{{D=20000-R}}}
2.{{{0.25*D+0.17*R=0.20*(20000)}}}
{{{0.25(20000-R)+0.17*R=4000}}}
{{{5000-0.25R+0.17R=4000}}}
{{{-0.08R=-1000}}}
{{{highlight(R=12500)}}}
From eq. 1,
{{{D=20000-R}}}
{{{D=20000-12500}}}
{{{highlight(D=7500)}}}