SOLUTION: I know the answer to the problem, but what I need is to know how to write the equation. So here it goes.... The perimeter of a rectangle is 70 meters. If the width is 40 % of the

Question 1040039: I know the answer to the problem, but what I need is to know how to write the equation. So here it goes....
The perimeter of a rectangle is 70 meters.
If the width is 40 % of the length, find the dimensions of the rectangle.
Answer by ikleyn(52781) (Show Source): You can put this solution on YOUR website!
.
I know the answer to the problem, but what I need is to know how to write the equation. So here it goes....
The perimeter of a rectangle is 70 meters.
If the width is 40 % of the length, find the dimensions of the rectangle.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Let L be the length. 
Then the width W = 0.4*L, according to the condition.

The perimeter is 

L + W + L + W = 2L + 2W = 2L + 2*0.4*L = 2.8L,

and we have an equation 

2.8L = 70.

Then L =  = 25 m.

Answer.  The length is 25 m.  The width is 0.4*25 = 10 m.

For many other similar problems see the lessons
    - Solved problems on the perimeter and side lengths of a triangle
    - Solved problems on the perimeter and side lengths of a right-angled triangle
    - Solved problems on the perimeter and the side lengths of a parallelogram
    - Solved problems on the perimeter and side lengths of a rectangle
in this site.

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