Virginia, Adrienne, and Dennis have taught history for a combined total of 87 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 the correct option.
A) 23 B) 32 C) 38 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 = 96   V= A+9   =&gt;A = V-9   V= D-9   =&gt; A = (D-9)-9 = D-18   D-9 + D-18 + D = 87   =&gt; 3D = 87+ 27= 
<gadget id="calculator">87+ 27</gadget>
<output>114</output>
114=&gt; D = 38   Answer 38
<result>C</result>
Virginia, Adrienne, and Dennis have taught history for a combined total of 87 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?