Question

If length and breadth ratio and perimeter is given how to find then length and breadth

Answer 1

If L is the length of the rectangle and B is the breadth of the rectangle, Then 
 The ratio of its Length and Breadth will be written as,

                         Ratio = L / B
  
Now the length can be Lx and Breadth can be Bx

Now, we are given that the perimeter of the rectangle is also given

So, Let the perimeter be P

And we know ,                          Perimeter =  2 (L + B)
Thus,                                                     P =  2 (Lx + Bx)
                                                              P =  2 (L + B) x
                                                              x = P / 2 (L + B)

Thus the value of x can be calculated this way and to Calculate the value of the length and breadth we can multiply the value of x with L and B above

Answer 2

Let length : breadth ratio be
L:B=k, where k is a constant
Therefore L=k*B
In case of a rectangle
Perimeter = 2(L+B)
= 2(k*B + B)
= 2(k +1)*B
Or Breadth B = perimeter/ ( 2*(k+1))
And length L= breadth *k