Question

The perimeter of a rectangular room is 120m .If the length is thrice the breadth, find the length and breadth of the room.​

Answer 1

Answer:

length = 45 m , breadth= 15 m

Step-by-step explanation:

l=3b

2(3b+b)=120

4b=60

b=15°

l=3×15=45°

Answer 2

Step by step explanation :

Given ,

perimeter = 120

Then,

Let the breadth be x and length be 3x

(length is thrive of breadth , so 3x )

Now,

perimeter = 2(l + b)

120 = 2( x + 3x )

= 2 x 4x

= 8x

x = 120 / 8

= 15

Answer:

Therefore , x = 15

3x = 15 x 3 = 45