I'm in mathematic 112 (Pre-Algebra)

I'm supposed to find the dimensions of the fictional apartment in the picture (attached), with the given area of the whole apartement which is 450sq ft and area of the Living Room which is 180sq ft. I don't know where to start.

I have tried a lot of step but I keep getting it wrong.

I though I had to get the sum of all the areas of the home and set them equal to 450, but it's not working can you help me get started thanks.