A cistern 2 meters wide and 4 meters long 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) 49
B) 87
C) 23
D) 66
E) 19
Area of the wet surface = [2(lb + bh + lh) - lb]   = 2(lh + bh) + lb   = [2 (4 x 1.25 + 2 x 1.25) + 2 x 4]   = 23   The answer is 23.
<result>C</result>
A cistern 2 meters wide and 4 meters long contains water up to a depth of 1 meter 25 cm. What is the total area of the wet surface?