A number is doubled and 9 is added. If the resultant is trebled, it becomes 75. What is that number? Pick:
A) 2
B) 4
C) 5
D) 8
E) 9

Rationale: "explanation : let the number be v . then , 3 ( 2 x + 9 ) = 75 . 2 x + 9 = 25 = > 2 x = 16 = > x = 8 answer : d ) 8"
Answer: D