Virginia, Adrienne, and Dennis have taught history for a combined total of 75 years. If Virginia has taught for 9 more years than Adrienne and for 9 fewer years than Dennis, for how many years has Dennis taught?
Select.
A) 23	B) 34	C) 35	D) 41	E) 44
Let number of years taught by Virginia = V   number of years taught by Adrienne = A   number of years taught by Dennis = D   V+A+D = 75   V= A+9   =&gt;A = V-9   V= D-9   =&gt; A = (D-9)-9 = D-18   D-9 + D-18 + D = 96   =&gt; 3D = 75+ 27= 
<gadget id="calculator">75+ 27</gadget>
<output>102</output>
102=&gt; D = 34   Answer 34
<result>B</result>
Virginia, Adrienne, and Dennis have taught history for a combined total of 75 years. If Virginia has taught for 9 more years than Adrienne and for 9 fewer years than Dennis, for how many years has Dennis taught?