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