Question

The length of a rectangle is three times its width and its perimeter is 90m. Find its length

Answer 1

Let the width be 'x'
It's width becomes '3x'

Perimeter of rectangle= 2L+2B = 2*(3x)+2*(x)
=6x+2x= 8x

given perimeter = 90
8x = 90

x= 45/4 m = 11.25 m = Length

3x= 33.75m = Width.


Hope this helps.

Answer 2

let the width be x..
then, length=3x
a/q,
2(3x+x)=90
8x=90
x=90/8
x=11.25
so, width is 11.25cm
and l is 3x11.25=33.75cm