Question 289539
Start with the formula for the perimeter of a rectangle:
{{{P = 2L+2W}}} Substitute: P = 160cm, L = 4W and solve for W.
{{{160 = 2(4W)+2W}}} Simplify.
{{{160 = 10W}}} Divide both sides by 10.
{{{highlight(W = 16)}}}cm. and {{{L = 4*16}}} so...
{{{highlight(L = 64)}}}cm.