Question

The length of a rectangle is 7cm more than its breadth . If the perimeter of the rectangle is 90cm,find its length and breadth

Answer 1

Let the width be a

Length = a+7 cm

Perimeter = 90

=> 2(a+a+7) = 90

=> 2a +7 = 45

=> 2a = 38

=> a = 19

Length = 26 cm

Width = 19 cm

Answer 2

let the breadth of rectangle = x
length = (x + 7)cm

Perimeter of rectangle = 90 cm
2(l+b) = 90
2(x+7+x)= 90
2(2x + 7) = 90
4x + 14 =90
4x = 76
x = 19

Length = 19 + 7 = 26 cm
Breadth = 19 cm