Question 1114419
*[illustration WAS.png].
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Originally,
{{{2L+2L+W+W=420}}}
{{{4L+2W=420}}}
1.{{{2L+W=210}}}
Then after the split,
{{{2L+2W=260}}}
2.{{{L+W=130}}}
Subtracting 2 from 1,
{{{2L+W-L-W=210-130}}}
{{{L=80}}}{{{ft}}}
Now use either equation to solve for W.