The average of first three prime numbers greater than 20 is?
Choose the correct option.
A) 10  B) 20  C) 30  D) 27.7  E) 50
23 + 29 + 31= 
<gadget id="calculator">23 + 29 + 31</gadget>
<output>83</output>
83/3= 27.7   ANSWER:27.7
<result>D</result>
The average of first three prime numbers greater than 20 is?