1) A number is doubled and 9 is added. If the resultant is trebled, it becomes 75. What is that number ? A) 3.5 B) 6 C) 8 D) 9 E) None of these Answer: Option CExplanation:Let the number be x.Then, 3(2x+9)=75⇔2x+9=25⇔2x=16⇔x=8.