Calculate the number of urns of water needed to fill a tank of dimensions of 10x10x5m to 90% full, if the volume of the urn is 0.8m3 and can only be filled to 80%.	Choose the correct choice:
A) 520  B) 650.2  C) 685.5  D) 703.1  E) 712.2
Volume of the tank that needed to be filled=10x10x5x0.9=450   Volume of the urn that can be filled=0.8x0.8=0.64   No. of urns of water needed to fill the tank=450/0.64= 703.1   Answer: 703.1
<result>D</result>
Calculate the number of urns of water needed to fill a tank of dimensions of 10x10x5m to 90% full, if the volume of the urn is 0.8m3 and can only be filled to 80%.