A number is doubled and 7 is added. If resultant is trebled, it becomes 99. What is that number  Options:
A) 8	B) 10	C) 14	D) 13	E) 16

Rationale: "explanation : = > 3 ( 2 x + 7 ) = 99 = > 2 x + 7 = 33 = > x = 13 option d"
Answer: D