A cistern 4m long and 2 m wide contains water up to a depth of 1 m 25 cm. The total area of the wet surface is:
Choose the most appropriate option.
A) 23 m2 B) 20 m2 C) 52 m2 D) 24 m2 E) 55 m2
Area of the wet surface	= [2(lb + bh + lh) - lb]   = 2(bh + lh) + lb   = [2 (2 x 1.25 + 4 x 1.25) + 4 x 2] m2   = 23 m2.   answer :23 m2
<result>A</result>
A cistern 4m long and 2 m wide contains water up to a depth of 1 m 25 cm. The total area of the wet surface is: