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:

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

Answer: Option A

Explanation:

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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