100 people are attending a newspaper conference. 40 of them are writers and more than 38 are editors. Of the people at the conference, x are both writers and editors and 2x are neither. What is the largest possible number of people who are both writers and editors?
Choose the correct choice from the following answers
A) 21
B) 24
C) 28
D) 30
E) 32
{Total}={Writers}+{Editors}-{Both}+{Neither}.   {Total}=100;   {Writers}=40;   {Editors}&gt;38;   {Both}=x;   {Neither}=2x;   100=40+{Editors}-x+2x --&gt; x=60-{Editors}. We want to maximize x, thus we should minimize {Editors}, minimum possible value of {Editors} is 39, thus x={Both}=60-39= 
<gadget id="calculator">60-39</gadget>
<output>21</output>
21.   21nswer: 21.
<result>A</result>
100 people are attending a newspaper conference. 40 of them are writers and more than 38 are editors. Of the people at the conference, x are both writers and editors and 2x are neither. What is the largest possible number of people who are both writers and editors?