Water lilies double in area every 24 hours. In spring, there is one water lily on a lake. In sixty days the lake is completely covered with lilies. How many days did it take to cover half of the lake?
A 10 foot rope ladder whose rungs are one foot wide is hanging over the side of a boat. At this time there is only 1 foot of ladder under the water. It now begins to rain heavily, if it rains at the rate of 1 foot every two hours, how many hours will it take to cover half of the ladder?
Can you tell what we are: Half of Four of us are Two of us, Twice Two of us are Six of us, Twice Eight of us are Ten of us, and Twice Five of us are Eight of us?
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