Question

Write the following information in mathematical form. The length of a rectangle is twice its breadth and its perimeter is 52.

Answer 1

l= 2b
So perimeter of rectangle = 2(l+b)
2(2b + b) = 52 replace the value l = 2b
2(3b) = 52
52/2=3b
26=3b
26/3=b 

Answer 2

let the length be l.

let the breadth be b.

A.T.Q.

l=2b--------(1)

2(l+b)=52

l+b=26------(2)

putting eqn.(1) in eqn.(2)

2b+b=26

3b=26

b=26/3

putting the value of b in eqn. (1)

l=2*(26/3)

l=52/3

therefore, the length of the rectangle is 52/3 cm and the breadth is 26/3 cm.