A cistern 5m long and 4 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:
A) 49 m2  B) 42.5 m2  C) 53.5 m2  D) 55 m2  E) 57 m2
Area of the wet surface	= [2(lb + bh + lh) - lb]   = 2(bh + lh) + lb   = [2 (4 x 1.25 + 5 x 1.25) + 5 x 4] m2   = 42.5 m2.   Answer: Option 42.5 m2
<result>B</result>
A cistern 5m long and 4 m wide contains water up to a depth of 1 m 25 cm. The total area of the wet surface is: