A container has a capacity of 20 gallons and is full of spirit. 4 gallons of spirit is drawn out and the container is again filled with water. This process is repeated 3 times. Find how much spirit is left in the resulting mixture finally?	Pick one
A) 6(257/525) gallons	B) 6(346/625) gallons	C) 6.5 gallons	D) 6.25 gallons	E) None of these
There is a direct formula to calculate such repetition:   Left QTY / Orig QTY = ( (Orig QTY - Rep QTY) / Orig QTY )^n   where n is number of times mixing done:   Left QTY / 20 = (20 -4)^3 / 20^3   Left QTY = 20 (16/20)^3   Left QTY = 20 ( 4/5 )^3   Left QTY = 10.24   Answer is None of these
<result>E</result>
A container has a capacity of 20 gallons and is full of spirit. 4 gallons of spirit is drawn out and the container is again filled with water. This process is repeated 3 times. Find how much spirit is left in the resulting mixture finally?