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[" 21.A boat having a length of "3" metr...

[" 21.A boat having a length of "3" metre and breadth "],[2" metre is floating on a lake.The boat sinks by one "],[" cm when a man gets on it.The mass of the man is "],[[" (1) "60kg," (2) "62kg],[" (3) "72kg," (4) "128kg]]

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