Question 172182
It follows, {{{P=2L+2W}}}
where-------->{{{system(P=158yards,W=23yards,L=L)}}}
Then,
{{{158=2L+2(23)}}}
{{{158-46=2L}}} 
{{{112=2L}}} ---------->{{{cross(112)56/cross(2)=cross(2)L/cross(2)}}}
{{{highlight(L=56yards)}}}, Answer
check by going back,
{{{158=2*56+2*23}}}
{{{158=112+46}}}
{{{158yards=158yards}}}
Thank you,
Jojo