We know that 13+PQ+4=20, since all line segments in the upper side of the plan are parallel to those in the bottom. Thus, the Logical approach to this question will focus on finding what QR is. This will allow us to represent the area of the floor as the sum of several rectangles and calculate it.
Statement (1) gives us exactly that, so it is enough on its own. Answer choices (B), (C) and (E) are eliminated.
Statement (2) is not enough (note that the question doesn't state whether QR's length is an integer). Answer choice (D) is eliminated.
The correct answer is (A).
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