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Creature and Fill tank -Math riddle

42.Math Riddles
There is a Creature which could double its size every day. So, if the Creature is put in a tank then it will fill the tank in 10 days. How many days would it take for the creature to fill 1/2 and 1/4 of the tank?
    • 9 days to fill 1/2 and 8 days to fill 1/4 of the tank.  
      Explanation :  
      If the creature fills the tank in 10 days and it doubles every day, on the ninth day it would fill 1/2 the tank. Thus on the 8th day it will fill 1/4 of tank.