A cistern 4 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?
Pick one:
A) 28
B) 32
C) 36
D) 40
E) 44
Area of the wet surface = [2(lb + bh + lh) - lb]   = 2(bh + lh) + lb   = [2 (4 x 1.25 + 4 x 1.25) + 4 x 4]   = 36   The answer is 36.
<result>C</result>
A cistern 4 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?