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?  Options
A) 42  B) 57  C) 27  D) 29  E) None of these
The total of seven numbers = 7 Ã— 18 = 126   The total of first 3 and last 3 numbers is = 3 Ã— 14+3 Ã— 19 = 99   So, the middle number is  (126 - 99 )= 
<gadget id="calculator"> (126 - 99 )</gadget>
<output>27</output>
27   ANSWER IS 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?