Question

Length of a rectatngle is three times its breadth. Perimeter of the rectangle is 40 cm. Find its length and width.

Answer 1

Step-by-step explanation:

let the breadth be X

breadth = X

length = 3x

perimeter = 40cm

perimeter = 2(l+b)

40= 2(3x+x)

40=6x+2x

40=8x

40/8 = x

5=x

breadth = X = 5

length= 3x=3*5= 15

Answer 2

Answer:

Length =15cm

Width =5cm

Step-by-step explanation:

b=x cm

l=3x cm

Perimeter of rectangle =40cm

2(l+b)=40

3x+x=40/2

4x=20

x=20/4

x=5

Length =3*5=15cm

Width =5cm