Question

9.The sides of a rectangle are in the ratio 5 : 4 and its perimeter is 90 cm. Find its length and breadth.​

Answer 1

Sides of the rectangle are in the ratio of 4:5

Let the length l=5x

and the breadth b=4x

Now, perimeter =2(l+b)=90cm

2(5x+4x)=90

2(9x)=90

18x=90

x=5

Therefore, Length l=5x=25cm

and the breadth b=4x=20cm

Answer 2

Heya friend !!!

Let 5 be 5x

and let 4 be 4x

So, 2×(5x+4x)= 90

=> 10x + 8x = 90

=> 18x = 90

$=> x = \frac{90}{18}$

=> x = 5

Putting values :-

5x = 5×5 = 25 [ Length ]

4x = 4×5 = 20 [ Breadth ]

Final Answer :-

Length = 25 cm

Breadth = 20 cm

Hope it helps friend !