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A cistern, open at the top, is to be ...

A cistern, open at the top, is to be lined with sheet of lead which weighs 27 kg/m2. The cistern is 4.5 m long and 3 m wide and holds 50 m3. The weight of lead required is (a) 1660.5 kg     (b) 1764.5 kg    (c) 1860.5 kg    (d) 1864.5 kg

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