Question

If the perimeter of a rectangle is 4oocm. and the length is 20cm.? find the width of a rectangle?

Answer 1

given:- l = 20cm
p= 400cm
b = ?

perimeter of rectangle = 2(l + b)
=> 400 = 2( 20 + b)
=> 400 = 40 + 2b
=> 2b = 360
=> b = 180cm

Answer 2

perimeter of rectangle=2(l+b)=400cm
2(20cm+b)=400cm
40cm+2b=400cm
2b=400cm-40cm
2b=360
b=360/2
b=180cm