A U-tube having horizontal arm of length 20 cm has a uniform cross-sectional area of 1 cm^2. It is filled with water of volume 60 cc. What should be the volume of liquid (in cc) of density 4 g/cc to be poured from one side into the U-tube such that no water is left in the horizontal arm of the tube ?(density of water-1 g/cc)
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