Question

The width of the rectangle is three fourth the length. If the perimeter is 84 cm, find the length and width of the rectangle ?

Answer 1

width =3/4l
b=3/4 l
l=?

so perimeter=2(l+b)
84=2(l+3/4l)
84/2=1.75l
42=1.75l
l=45/1.75
l=25.7
l=26 cm approx

so,
length=26cm
width=26×3/4
=19.5cm

Answer 2

width - 3
length- 4

perimeter-14
given 84,

14*6=84,

width 3*6= 18
lenth 4*6 = 24