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A U-tube having horizontal arm of length...

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

A

60 c c

B

45 c c

C

50 c c

D

35c c

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