Question

the length of a rectangular park is twice it's breadth. if the perimeter of the rectangle is 90cm.find it's length and breadth.

Answer 1

let Breadth=x
length=2x
perimeter=2(L+B)
=2(x+2x)=90
3x=45
breadth,x=15cm
length,2x=30cm

Answer 2

let length = x and breadth = y
atq, x=2y and 2(x+y) = 90
2(2y+y)= 90
6y=90
y= 15cm (breadth)
x=2y=2*15= 30cm (length)