A cistern 8 meters long and 4 meters wide contains water up to a depth of 1 meter 25 cm. What is the total area of the wet surface?
Choose the correct choice from the following answers:
A) 40 B) 48 C) 54 D) 62 E) 76
Area of the wet surface = [2(lb + bh + lh) - lb]   = 2(bh + lh) + lb   = [2 (4 x 1.25 + 8 x 1.25) + 8 x 4]   = 62   The answer is 62.
<result>D</result>
A cistern 8 meters long and 4 meters wide contains water up to a depth of 1 meter 25 cm. What is the total area of the wet surface?