Question 883288
{{{P=2*(L+W)=286}}}
{{{L+W=143}}}
.
.
{{{W/L=3/10}}}
{{{W=(3/10)L}}}
Substitute,
{{{L+(3/10)L=143}}}
{{{(13/10)L=143}}}
{{{L=143(10/13)}}}
{{{highlight(L=110)}}}
Then,
{{{W=(3/10)L}}}
{{{W=(3/10)(110)}}}
{{{highlight(W=33)}}}