Question

the sides of a rectangle are in the ratio 5:4. If its perimeter is 72cm then the length is

Answer 1

Ratio of the length to breadth=5:4
Let length=5x
breadth=4x
Perimeter of the rectangle=72 cm
2(l+b)=72 m
2(5x+4x)=72
2(9x)=72
18x=72
x=72/18
x=4
Length=5x=5(4)=20 cm

Answer 2

Given,
the ratio of the sides of a rectangle is = 5:4
the perimeter of a rectangle = 72
let the length be 5x and breadth be 4x
then,2(5x+4x)=72
2(9x)=72
9x=36
x=4
therefore length and breadth of a rectangle are 20cm and 16cm respectively