Student: The average of seven numbers is 15. The average of first three numbers is 14 and the average of last three numbers is 19. What is the middle number?\nOptions:\n(A) 6\n(B) 29\n(C) 31\n(D) 34\n(E) 35.
Another student: Let's say, hmmm...

User
The total of seven numbers = 7X15 = 105\nThe total of first 3 and last 3 numbers is = 3 X 14+3 X 19 = 99\nSo, the middle number is (105 - 99 ) = 6 Final answer: (A).
Assistant