A certain rectangular window is (2/5) times as long as it is wide. If its perimeter is 28 feet, what are its dimensions in terms of length by width?  Pick one.
A) 12 by 2  B) 11 by 3  C) 10.5 by 3.5  D) 10 by 4  E) 9 by 3
2x+2y=28   x+y=14   x+(2/5)x=14   1.4x=14   x=10   Answer 10 by 4
<result>D</result>
A certain rectangular window is (2/5) times as long as it is wide. If its perimeter is 28 feet, what are its dimensions in terms of length by width?