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A pile foundation is composed of 4 vertical and 3 batter piles in a row. Each vertical pile can carry 20 t of compressive load,

A pile foundation is composed of 4 vertical and 3 batter piles in a row. Each vertical pile can carry 20 t of compressive load, and each batter pile can carry 5 t of compressive load. If a horizontal load of 60 t is acting on the foundation, what should be the inclination of the batter piles with the vertical axis in degrees?

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