Question

the side of a rectangle are in the ratio 5 : 4 and its perimeter is 90 cm find its length and breadth

Answer 1

let the length be 5 x,,, breadth be 4 x

perimeter=2(l+b)

90=2(5x+4x)

45=9x

x=45/9=5

length=5x=5×5=25

breadth=4x=4×5=20

Answer 2

let the sides be 5x and 4x now,

perimeter=90

l+b=45

9x=45

x=5

length=25

breadth=20