Question

the length of rectangle is 20 cm more than its breadth. if the perimeter is 100 cm find the dimension of rectangle

Answer 1

let the breadth be x.
therefore,length=x+20.
p=100cm
2(x+20+x)=100
4x+40=100
4x=100-40
x=60/4
x=15
therefore,breadth=15cm and length =15+20=35cm.

Answer 2

Answer:

Dimensions of the rectangle:

Breadth (b) = 15 cm

Breadth (b) = 15 cmLength (l) = 35 cm

Explanation:

Let breadth of a rectangle = bcm

length (l) = 20 cm more than its breadth

= (b+20)cm

Perimeter of the rectangle (P) = 100 cm [given]

=> 2(length+breadth) = 100cm

=> 2(b+20+b)=100 cm

$\implies 2b+20=\frac{100cm}{2}$

$\implies 2b = 50cm -20cm$

$\implies 2b = 30cm$

$\implies b = \frac{30cm}{2}$

$\implies b = 15cm$

Therefore,

Dimensions of the rectangle:

Breadth (b) = 15 cm

Length (l) = b+20

= 15+20

= 35 cm

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