A certain rectangular window is four times as long as it is wide. If its perimeter is 50 feet, what are its dimensions in terms of length by width?  Choose the correct option.
A) 12 by 2	B) 11 by 3	C) 20 by 5	D) 10 by 4	E) 9 by 3
2x+2y=50   x+y=25   x+4x=25   5x=25   x=5   Answer 20 by 5
<result>C</result>
A certain rectangular window is four times as long as it is wide. If its perimeter is 50 feet, what are its dimensions in terms of length by width?