A rectangular cube has a volume of 9 cubic feet. If a similar cube is twice as long, twice as wide, and twice as high, then the volume, in cubic feet of such cube is?
Choices	Choose the correct option:	A) 24	B) 48	C) 81	D) 72	E) 100
Lets say the sides of the rectangular cube are x, y and z. Problem states volume is 9.   i.e,   x*y*z = 9 .   If every side is increased twice as before. then new volume is   2x*2y*2z = 9*(x*y*z) = 8*9= 
<gadget id="calculator">8*9</gadget>
<output>72</output>
72.   Answer is 72
<result>D</result>
A rectangular cube has a volume of 9 cubic feet. If a similar cube is twice as long, twice as wide, and twice as high, then the volume, in cubic feet of such cube is?
Choices