A cistern 6 m long and 4 m wide contains water up to a depth of 1 m 25 cm. The total area of the west surface is : Choose the correct choice from the following choices: A) 49 m2 B) 50 m2 C) 53.5 m2 D) 55 m2 E) None of these
Solution   Area of the west surface = [2(lb + bh + lh) - lb] = 2 (bh + lh) + lb   = [2(4 × 1.25 + 6 × 1.25) + 6 × 4]m2 = 49m2.   49 m2nswer 49 m2
<result>A</result>
A cistern 6 m long and 4 m wide contains water up to a depth of 1 m 25 cm. The total area of the west surface is :