Question

The perimeter of a rectangle is 30cm . If its breadth is 3 cm then it's length is ?

Answer 1

Answer:

10 cm

Step-by-step explanation: let the length be x

perimeter = l × b = 30

x × 3 = 30 cm

3x = 30 cm

x= 30/3

x = 10 cm

length = x = 10 cm

Answer 2

Step-by-step explanation:

Perimeter = 30cm

Let breadth be ‘x’

Therefore, length = (x-3)

Now,

P = 2( length+breath )

30 = 2( x-3+x )

30 = 2( 2x - 3)

30 = 4x - 6

30 + 6 = 4x

36/4 = x

9 = x

Breath = x => 9

Length = x -3 => 9 - 3 = 6