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Volume and Surface Area - General Aptitude

Q1:

A cistern 6m long and 4 m wide contains water up to a depth of 1 m 25 cm. The total area of the wet surface is:

A 49 m2

B 50 m2

C 53.5 m2

D 55 m2

ANS:A - 49 m2

Area of the wet surface = [2(lb + bh + lh) - lb]
  = 2(bh + lh) + lb
  = [2 (4 x 1.25 + 6 x 1.25) + 6 x 4] m2
  = 49 m2.