Solution: A tube partly filled with gasoline sits in a basin of water as shown in the figure at right. The gasoline floats on the water so that its surface is 3.5 inches above the surface of the water. How far below the surface of the water is the gasoline-water interface?

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A tube partly filled with gasoline sits in a basin of water as shown in the figure at right. The gasoline floats on the water so that its surface is 3.5 inches above the surface of the water. How far below the surface of the water is the gasoline-water interface?