The average of 11 numbers is 10.9. If the average of first six is 10.5 and that of the last six is 11.5 the sixth number is?
Pick:  A) 11.4  B) 11.3  C) 11.8  D) 12.1  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 * 11.5= 
<gadget id="calculator">6 * 11.5</gadget>
<output>69</output>
69   63 + 69= 
<gadget id="calculator">63 + 69</gadget>
<output>132</output>
132 – 119.9= 12.1   6th number = 12.1   Answer: 12.1
<result>D</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 11.5 the sixth number is?