A rectangular wall is covered entirely with two kinds of decorative tiles: regular and jumbo. 1/3 of the tiles are jumbo tiles, which have a length three times that of regular tiles and have the same ratio of length to width as the regular tiles. If regular tiles cover 90 square feet of the wall, and no tiles overlap, what is the area of the entire wall?
Choose the correct choice
A) 160
B) 240
C) 360
D) 495
E) 560
The number of jumbo tiles = x.   The number of regular tiles = 2x.   Assume the ratio of the dimensions of a regular tile is a:a --&gt; area = a^2.   The dimensions of a jumbo tile is 3a:3a --&gt; area = 9a^2.   The area of regular tiles = 2x*a^2 = 90.   The area of jumbo tiles = x*9a^2 = 4.5(2x*a^2 ) = 4.5*90= 
<gadget id="calculator">4.5*90</gadget>
<output>405</output>
405.   Total area= 90 + 405= 
<gadget id="calculator">90 + 405</gadget>
<output>495</output>
495   Answer: 495.
<result>D</result>
A rectangular wall is covered entirely with two kinds of decorative tiles: regular and jumbo. 1/3 of the tiles are jumbo tiles, which have a length three times that of regular tiles and have the same ratio of length to width as the regular tiles. If regular tiles cover 90 square feet of the wall, and no tiles overlap, what is the area of the entire wall?