The number of water lilies on a certain lake doubles every two days. If there is exactly one water lily on the lake, it takes 60 days for the lake to be fully covered with water lilies. In how many days will the lake be fully covered with lilies, if initially there were 64 water lilies on it?
Correct answer: D
Explanation
Starting from 1 Water Lilly it takes 60 days.
If there are already two present, it can be taken as the first day is over.
It will take 59 more days.
Notice that we are told thatthe number of water lilies on a certain lake doubles every two days, thus if initially there were 64 water lilies instead of one, we can consider that 7 days are over and therefore only 53 days are left.
D.
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