A number is doubled and 9 is added. If resultant is trebled, it becomes 81. What is that number  Choose the correct choice from the following
A) 9 B) 10 C) 12 D) 14 E) 15

Rationale: "explanation : = > 3 ( 2 x + 9 ) = 81 = > 2 x + 9 = 27 = > x = 9 answer : option a"
Answer: A