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Volume and Surface Area - General Aptitude

Q1:

A boat having a length 3 m and breadth 2 m is floating on a lake. The boat sinks by 1 cm when a man gets on it. The mass of the man is:

A 12 kg

B 60 kg

C 72 kg

D 96 kg

ANS:B - 60 kg

Volume of water displaced = (3 x 2 x 0.01) m3
  = 0.06 m3.
 Mass of man = Volume of water displaced x Density of water
  = (0.06 x 1000) kg
  = 60 kg.