The average of seven numbers is 4. The average of first three numbers is 2 and the average of last three numbers is 6. What is the middle number?  Choose the correct option:
A) 3
B) 4
C) 6
D) 7
E) 8
The total of seven numbers = 7X4 = 28   The total of first 3 and last 3 numbers is = 3 X 2+3 X 6 = 24   So, the middle number is  (28 - 24 )= 
<gadget id="calculator"> (28 - 24 )</gadget>
<output>4</output>
4   4
<result>B</result>
The average of seven numbers is 4. The average of first three numbers is 2 and the average of last three numbers is 6. What is the middle number?