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2014-07-24T23:03:59+05:30

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Very simple..
Area of bottom (cross-section) of tank  =  20 * 10 = 200 cm²
Volume of water poured into it = 1 litre = 1000 cm³
let the height or depth of water be H cm. 
Then volume of water in tank is = area * height = 200 * H cm³

  So       200 H = 1000     =>    H = 5 cm

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2014-07-25T22:16:45+05:30
Volume = 1000cm3
volume = l*b*h
1000=20*10*h
h= 1000/200
h= 5cm

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