Three years ago the average age of a family of eight members was 20 years. A boy have been born, the average age of the family is the same today. What is the age of the boy?	Choose the correct answer:	A) A)4	B) B)3	C) C)2	D) D)1	E) E)5
8 * 23= 
<gadget id="calculator">8 * 23</gadget>
<output>184</output>
184   9 * 20= 
<gadget id="calculator">9 * 20</gadget>
<output>180</output>
180   --------------   4   4nswer: 4
<result>A</result>
Three years ago the average age of a family of eight members was 20 years. A boy have been born, the average age of the family is the same today. What is the age of the boy?