A cistern 4 m long and 8 m wide contains water up to a depth of 1 m 25 cm. The total area of the wet surface is:  Choose the correct choice from the following answers
A) 49 m2  B) 50 m2  C) 52 m2  D) 62 m2  E) 55 m2
Area of the wet surface	= [2(lb + bh + lh) - lb]   = 2(bh + lh) + lb   = [2 (8 x 1.25 + 4 x 1.25) + 8 x 4] m2   = 62 m2.   answer :62 m2
<result>D</result>
A cistern 4 m long and 8 m wide contains water up to a depth of 1 m 25 cm. The total area of the wet surface is: