A cistern 6m long and 4 m wide contains water up to a depth of 1 m 25 cm. The to

Question

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:

Options:

A . 49 m²

B . 50 m²

C . 53.5 m²

D . 55 m²

Answer: Option A

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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