Question

the length of rectangle is twice of its breadth and perimeter is 300cm find length and breadth

Answer 1

Let The Breadth Of Rectangle be X
So Length=2x
Perimeter=2(L+B)
300=2(x+2x)
300=2(3x)
300=6x
x=300/6
x=50cm

Breadth=x=50cm
Length=2x=2*50=100cm

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Answer 2

2(l+b)=300
let breadth be x
then,
length=2x
2(2x+x)=300
2(3x)=300
6x=300
x=50
breadth=50
and,
length=2x=2×50
=100