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1. 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
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By: guest on 01 Jun 2017 05.49 pm
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.
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