The total of seven numbers = 7X24 = 168
The total of first 3 and last 3 numbers is = 3 X 14+3 X 19 = 99
So, the middle number is (168 - 99 ) = 69
The average of seven numbers is 24. The average of first three numbers is 14 and the average of last three numbers is 19. What is the middle number?

A: 27
B: 29
C: 31
D: 34
E: 69