Question 1196598
let the length be {{{L}}} and the width {{{W}}}

perimeter is {{{P=2(L+W)}}}

if the length is {{{twice}}} its width, we have {{{L=2W}}}

then 

{{{P=2(2W+W)}}}
{{{P=2(3W)}}}
{{{P=6W}}}

if the perimeter of a Jamaican flag is {{{60}}} inches, then

{{{60in=6W}}}

{{{W=10in}}}


and

{{{L=2*10in}}}

{{{L=20in}}}

 
 the dimensions of the flag: {{{20in}}} by {{{10in}}}