A cistern 8 m long and 6 m wide contains water up to a depth of 1 m 25 cm. The total area of the wet surface is:
Answers:  A) 80 m2  B) 50 m2  C) 83 m2  D) 86 m2  E) 55 m2
Area of the wet surface	= [2(lb + bh + lh) - lb]   = 2(bh + lh) + lb   = [2 (6 x 1.25 + 8 x 1.25) + 8 x 6] m2   = 83 m2.   answer :83 m2
<result>C</result>
A cistern 8 m long and 6 m wide contains water up to a depth of 1 m 25 cm. The total area of the wet surface is: