Question

The area of rectangle ABCD below is 108 square inches, what is the length in inches of a side of a square S?(linked image)
http://imageshack.us/photo/my-images/442/mathc.png/

Answer 1

Image again:

Answer 2

let the length of the side of square be X

then total length be 7+X
total breadth be 4+X
......
as area is 108.....

area is length *breadth=(7+x)(4+x)

but area is 108...so
(7+x)(4+x)=108..

solve for x...