A rock was dropped from a platform on a tower 55 feet above a lake. The rock landed on the bottom of the lake, which was 21 feet under the surface of the lake. Where was the rock when it had fallen halfway?

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A rock was dropped from a platform on a tower 55 feet above a lake. The rock landed on the bottom of the lake, which was 21 feet under the surface of the lake. Where was the roc…

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