Three years ago the average age of a class of six members was 24 years. A boy have been added, the average age of the class is the same today. What is the age of the boy?  Select.
A) A)1 B) B)2 C) C)3 D) D)4 E) E)6
6 * 27= 
<gadget id="calculator">6 * 27</gadget>
<output>162</output>
162   7 * 24= 
<gadget id="calculator">7 * 24</gadget>
<output>168</output>
168   `6   6
<result>E</result>
Three years ago the average age of a class of six members was 24 years. A boy have been added, the average age of the class is the same today. What is the age of the boy?