Virginia, Adrienne, and Dennis have taught history for a combined total of 102 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) 32	C) 35	D) 43	E) 44
Let number of years taught by Virginia = V   number of years taught by Adrienne = A   number of years taught by 43ennis = 43   V+A+43 = 96   V= A+9   =&gt;A = V-9   V= 43-9   =&gt; A = (43-9)-9 = 43-18   43-9 + 43-18 + 43= 
<gadget id="calculator">43-9 + 43-18 + 43</gadget>
<output>102</output>
102=&gt; 343 = 102 + 27= 
<gadget id="calculator">102 + 27</gadget>
<output>129</output>
129=&gt; 43 = 43   Answer 43
<result>D</result>
Virginia, Adrienne, and Dennis have taught history for a combined total of 102 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?