The average age of a husband and a wife is 23 years when they were married FOUR years ago but now the average age of the husband, wife and child is 20 years(the child was born during the interval). What is the present age of the child?	Choose the most appropriate option.
A) 7 years	B) 9 years	C) 6 years	D) 4 years	E) 5 years
27 * 2= 
<gadget id="calculator">27 * 2</gadget>
<output>54</output>
54   20 * 3= 
<gadget id="calculator">20 * 3</gadget>
<output>60</output>
60   -----------   6 years   Answer: 6 years
<result>C</result>
The average age of a husband and a wife is 23 years when they were married FOUR years ago but now the average age of the husband, wife and child is 20 years(the child was born during the interval). What is the present age of the child?