Question

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?
Now side is x and the other is 2x.

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

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

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