The average of first four prime numbers greater than 20 is?
Choose the correct choice from the following
A) 10 B) 20 C) 30 D) 40 E) 50
23 + 29 + 31 + 37= 
<gadget id="calculator">23 + 29 + 31 + 37</gadget>
<output>120</output>
120/4= 
<gadget id="calculator">120/4</gadget>
<output>30</output>
30   ANSWER:30
<result>C</result>
The average of first four prime numbers greater than 20 is?