Question

the level of water is doubled every minute in a bucket. If it is half filled in 10 minutes find when will it be completely filled in?

Answer 1

of course 9th minute it would be half of the bucket and at 10th it has filled it!.
yes?.....

Answer 2

The answer is 11 mins.
Because every minute, water level doubles. So at 10 min mark ,container was half filled. At 11th minute, it doubles and we have full container of water.