Rectangular Floors X and Y have equal area. If Floor X is 10 feet by 18 feet and Floor Y is 9 feet wide, what is the length of Floor Y, in feet?	Choose the correct choice from the following:	A) 13 1/2	B) 20	C) 18 3/4	D) 21	E) 24
The area of a rectangle is: Area = length x width   We are given that floor X is 10 feet by 18 feet and that floor Y is 9 feet wide. So we can say:   length of X = 10   width of X = 18   width of Y = 9   length of Y = n   We also can say:   Area of Floor X = Area of Floor Y   (length of X)(width of X) = (length of Y)(width of Y)   (10)(18) = 9n   (10)(2) = n   20 = n   Answer 20.
<result>B</result>
Rectangular Floors X and Y have equal area. If Floor X is 10 feet by 18 feet and Floor Y is 9 feet wide, what is the length of Floor Y, in feet?