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A cistern of capacity 8000 litres measures externally 3.3 m by 2.6 m by 1.1 m and its walls are 5 cm thick. The thickness of the bottom is:

Options:
A .  90 cm
B .  1 dm
C .  1 m
D .  1.1 cm
E .  None of these
Answer: Option B
 -    Let the thickness of the bottom be x cm.
  Then, [(330 - 10) x (260 - 10) x (110 - x)] = 8000 x 1000
  320 x 250 x (110 - x) = 8000 x 1000
  (110 - x) =  8000 x 1000  = 100 320 x 250

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