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Statement of a problem № 3084

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A stone is thrown from ground level over horizontal ground. It just clears three walls, the successive distances between them being r and 2r . The inner wall is 15/7 times as high as the outer walls which are equal in height. The total horizontal range is nr, where n is an integer. Find n.

Solution:
A stone is thrown from ground level over horizontal ground. It just clears three

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