A number is doubled and 5 is added. If the resultant is trebled, it becomes 123. What is that number?
Choose the correct choice from the following answers.
A) 12  B) 29  C) 27  D) 18  E) 99

Rationale: "explanation : let the number be x . therefore , 3 ( 2 x + 5 ) = 123 6 x + 15 = 123 6 x = 108 x = 18 answer : d"
Answer: D