A number is doubled and 9 is added. If resultant is trebled, it becomes 57. What is that number  Choose the correct choice from the following choices
A) 5	B) 10	C) 12	D) 14	E) 15

Rationale: "explanation : = > 3 ( 2 x + 9 ) = 57 = > 2 x + 9 = 19 = > x = 5 answer : option a"
Answer: A