There are 54 people in a certain community who belong to the local golf club, tennis club or both clubs. If twice as many people belong to the tennis club as belong to the golf club, what could be the number of people who belong to both clubs? Choose one:
A) 1) 4  B) 2) 7  C) 3) 17  D) 4) 21  E) 5) 27
x -&gt; Golf Club   2x -&gt; Tennis Club   y -&gt; both   x+2x-y = 51   3x - y =51   multiples of 3 greater than 51   57   60   63   66   69   72 - 21= 
<gadget id="calculator">72 - 21</gadget>
<output>51</output>
51   IMO (4) 21)
<result>D</result>
There are 54 people in a certain community who belong to the local golf club, tennis club or both clubs. If twice as many people belong to the tennis club as belong to the golf club, what could be the number of people who belong to both clubs?