Question

How we find length when breadth is 20 and perimeter is 100​

Answer 1

perimeter = 2(l+b)

therefore,b=20 and perimeter = 100

100=2(L+20)

50=L+20

L=50-20

L=30

Answer 2

Given:-

breadth=20cm

perimeter=100cm

To find:-

length

SOLUTION:-

perimeter=2(l+b)

100=2(x+20)

100=2x+40

2x=100-40

2x=60

x=60/2

x=30

so,

length=30cm