The average of seven numbers is 18. The average of first three numbers is 14 and the average of last three numbers is 19. What is the middle number?
Answers:
A) 19
B) 22
C) 27
D) 29
E) 31
The total of seven numbers = 7X18 = 126   The total of first 3 and last 3 numbers is = 3 X 14+3 X 19 = 99   So, the middle number is  (126 - 99 )= 
<gadget id="calculator"> (126 - 99 )</gadget>
<output>27</output>
27   27)
<result>C</result>
The average of seven numbers is 18. The average of first three numbers is 14 and the average of last three numbers is 19. What is the middle number?