Question 184893
Start with the formula for the perimeter of a rectangle:
{{{P = 2(L+W)}}} where L = Length and W = Width.
The problem states that "It is twice as long as it is wide", so...
{{{L = 2W}}} Substitute into the formula:
{{{P = 2(2W+W)}}} and P = 90 m, so...
{{{90 = 2(3W)}}} Divide both sides by 2.
{{{45 = 3W}}} Divide both sides by 3.
{{{15 = W}}} so...
{{{W = 15}}}m. and {{{L = 30}}}m.