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A cistern 6 m long, 4 m wide, contains water to a depth of 1 m 25 cm : find the area of the wet surface.

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The wet surface will be: the base 6X4=24 m2 plus 2 walls of 1.25X4 = 10m2 plus two walls of 1.25X6 = 15m2
total 24+10+15=49m2