A cistern 9 m long and 6 m wide contains water up to a breadth of 2 m 25 cm. Find the total area of the wet surface.
Choose the correct choice from the following answers.
A) 142 m sqaure	B) 122 m sqaure	C) 135 m sqaure	D) 188 m sqaure	E) none of these

Rationale: "explanation : area of the wet surface = 2 [ lb + bh + hl ] - lb = 2 [ bh + hl ] + lb = 2 [ ( 6 * 2.25 + 9 * 2.25 ) ] + 9 * 6 = 122 m square option b"
Answer: B