A boat having a length 6 m and breadth 3 m is floating on a lake. The boat sinks by 1 cm when a man gets on it. The mass of the man is:  Choose the correct choice from the following answers: A) 100 kg B) 120 kg C) 89 kg D) 180 kg E) 110 kg

Rationale: "volume of water displaced = ( 6 x 3 x 0.01 ) m 3 = 0.18 m 3 . mass of man = volume of water displaced x density of water = ( 0.18 x 1000 ) kg = 180 kg . answer : d"
Answer: D