A certain rectangular window is three times as long as it is wide. If its perimeter is 32 feet, what are its dimensions in terms of length by width?  Options
A) 12 by 2  B) 11 by 3  C) 10.5 by 3.5  D) 12 by 4  E) 9 by 3
2x+2y=32   x+y=16   x+3x=16   4x=16   x=4   Answer 12 by 4
<result>D</result>
A certain rectangular window is three times as long as it is wide. If its perimeter is 32 feet, what are its dimensions in terms of length by width?