180 in² - the area
width × lenght - the area
length : width = 5 : 4 therefore length = 5x and width = 4x
(x - some unit of length)
The equation:
(5x)(4x) = 180
20x² = 180 divide both sides by 20
x² = 9 → x = √9 → x = 3 in.
The length = 5x, therefore your answer is:
5x = 5(3 in) = 15in
