A number is doubled and 9 is added. If resultant is trebled, it becomes 51. What is that number  Select the correct option:
A) 4
B) 10
C) 12
D) 14
E) 15
Explanation:   =&gt; 3(2x+9) = 51   =&gt; 2x+9 = 17   =&gt; x = 4   4nswer: Option 4
<result>A</result>
A number is doubled and 9 is added. If resultant is trebled, it becomes 51. What is that number