Riddle:
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 a half and how many days to fill a quarter of the tank?
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Hint:
To solve this problem, work backwards from the tenth day. If the creature doubles in size, then on the ninth day it will be...
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Answer:
9 days to fill half and 8 days to fill a quarter - Since the creature always doubles in size.