Ghazali has 7 stacks of chairs with 20 chairs in each stack. He places each chair equally spaced apart to form the perimeter of a rectangle. The number of chairs along its length is twice the number of chairs along its breadth. How many chairs are there on each side of the rectangle?

Answer 1

Now side is x and the other is 2x.

2x + 2(2x) = 7(20)

Solve for x, then 2x.

Answer 2

If the breadth has x chairs, then 2(x-1 + 2x-1) = 7*20