Question

8. The sides of a rectangle are in the ratio of 5 : 4. If its perimeter is 144 cm, then its length
is
​

Answer 1

Answer: 40cm

Step-by-step explanation:

Let length be 5x and breadth be 4x

Perimeter of rectangle = 2(l + b) = 144cm

= 2( 5x + 4x) = 144cm          [substitute]

18x = 144

x = 8        [ 144/18]

Length = 5x = 5 x 8

40cm

Answer 2

Answer:

Let side are 5a and 4a

Perimeter =2(l+b)

2(5a+4a)=144

2(9a)=144

18a=144

a=144/18=8

Length =8×5

Breadth=4×8=32

So, length is 40 cm