The average of 11 numbers is 10.9. If the average of first six is 10.5 and that of the last six is 11.2 the sixth number is?
Choose one:
A) 9.5 B) 10 C) 10.3 D) 11.5 E) 12
Explanation:   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 * 11.2= 
<gadget id="calculator">6 * 11.2</gadget>
<output>67.2</output>
67.2   63 + 67.2= 
<gadget id="calculator">63 + 67.2</gadget>
<output>130.2</output>
130.2 – 119.9= 10.3   6th number = 10.3   Option 10.3
<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 11.2 the sixth number is?