The average of 11 numbers is 10.9. If the average of first six is 10.5 and that of the last six is 11.7 the sixth number is?  Choose one:
A) 11.4	B) 11.3	C) 13.3	D) 11.5	E) 11.1
1 to 11 = 11 * 10.9= 
<gadget id="calculator">11 * 10.9</gadget>
<output>119.9</output>
119.9   1 to 6= 6 * 10.5= 
<gadget id="calculator">6 * 10.5</gadget>
<output>63</output>
63   6 to 11= 6 * 11.7= 
<gadget id="calculator">6 * 11.7</gadget>
<output>70.2</output>
70.2   63 + 70.2= 
<gadget id="calculator">63 + 70.2</gadget>
<output>133.2</output>
133.2 – 119.9= 13.3   6th number = 13.3   Answer: 13.3
<result>C</result>
The average of 11 numbers is 10.9. If the average of first six is 10.5 and that of the last six is 11.7 the sixth number is?