Question 1008780


perimeter of a rectangle is {{{P=48cm}}}. 
The width {{{W}}} is one third the length {{{L}}}.
{{{W=L/3}}}
 
{{{P=2L+2W}}}

{{{48cm=2L+2L/3}}}

{{{48cm=6L/3+2L/3}}}

{{{48cm=8L/3}}}

{{{48cm*3=8L}}}

{{{L=(48cm*3)/8}}}

{{{L=144cm/8}}}

{{{L=18cm}}}

now find {{{W=L/3}}}

{{{W=18cm/3}}}

{{{W=6cm}}}