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there are water lilies on a lake. each day, the amount of water lilies doubles. after 20 days, there are so many water lilies that the entire lake is covered. after how many days was half of the lake covered?

Answer :

We are aware that by day 20, the blossom will have covered half of the lake, or 1/2. It doubles the following day to become 1, which equals the entire lake. Knowing that the following day is  21.

Given that:

Each day, the amount of water lilies doubles. after 20 days, there are so many water lilies that the entire lake is covered.

we have something that doubles so 2 times something

after 20days = 20 × 2 = 40

However, we are aware that by day 20, the blossom will have covered half of the lake, or 1/2. It doubles the following day to become 1, which equals the entire lake. Knowing that the following day is  21.

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