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A lake is covered in water lilies. Each day, the amount of lilies doubles. If it took 48 days for the lilies to cover the entire lake, how long did it take them to cover half of it?

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Interesting fact:

At a staggering score of 230, Australian mathematician Terence Tao can claim to have the highest IQ ever measured. Even as a baby he would solve mathematical conundrums. He got his master's degree at age 16, received his doctorate at 20 and became a professor at the University of California at the tender age of 24.