The average of 11 numbers is 10.9. If the average of first six is 10.5 and that of the last six is 11.4 the sixth number is?  Options:  A) 11.9  B) 11.2  C) 11.6  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 * 11.4= 
<gadget id="calculator">6 * 11.4</gadget>
<output>68.4</output>
68.4   63 + 68.4= 
<gadget id="calculator">63 + 68.4</gadget>
<output>131.4</output>
131.4 – 119.9= 11.5   6th number = 11.5   Answer: 11.5
<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 11.4 the sixth number is?