The average of 1st 3 of 4 numbers is 16 and of the last 3 are 15. If the sum of the first and the last number is 19. What is the last numbers? Choose the correct choice from the following answers
A) 2  B) 4  C) 6  D) 8  E) 7
A + B + C = 48   B + C + 8 = 45   A + 8 = 19   A – 8 = 3   A + 8 = 19   28 = 16   8 = 8   ANSWER 8
<result>D</result>
The average of 1st 3 of 4 numbers is 16 and of the last 3 are 15. If the sum of the first and the last number is 19. What is the last numbers?