Question 1084902
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{{{L/w=7/3}}}
{{{L=(7w)/3}}}
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{{{2*(7w)/3+2*w=60}}}---------using perimeter formula
{{{7w/3+w=30}}}

{{{7w+3w=90}}}

{{{10w=90}}}

{{{highlight(w=9)}}}
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{{{L=7*9/3}}}
{{{highlight(L=21)}}}