Question

Q22.The length of a rectangle is three times its breadth. If its perimeter is 40 cm,then
(i). The length of the rectangle is
6cm
10cm
15cm
18cm
The breadth of the rectangle is

5cm
6cm
7cm
8cm​

Answer 1

Step-by-step explanation:

l = 3b

2(l +b)= 40 ( perimeter of a rectangle)

2(3b+b)=40

2(4b)=40

4b = 20

b = 5

l= 3b =3(5)= 15

Answer 2

Answer:

length = 15 cm , breadth = 5 cm

Step-by-step explanation:

Let the breadth be x

So , Length = 3x

Now , Perimeter of Rectangle = 2 ( l + b )

40 = 2 ( 3x+x)

40 = 2 ( 4x )

40 = 8x

40/8 = x

5 = x

or x = 5

Now put the values

length = 3x = 15 cm

breadth = x = 5 cm