A number is doubled and 9 is added. If the resultant is trebled, it becomes 81. What is that number?	Choose the correct choice:
A) 3.5	B) 6	C) 8	D) 7	E) 9
Let the number be x. Then,   3(2x + 9) = 81   2x = 18 =&gt; x = 9   ANSW9R:9
<result>E</result>
A number is doubled and 9 is added. If the resultant is trebled, it becomes 81. What is that number?