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 11. What is the last numbers?
Choose the most appropriate option
A) 2  B) 4  C) 6  D) 5  E) 7
A + 4 + C = 48   4 + C + D = 45   A + D = 11   A – D = 3   A + D = 11   2D = 8   D = 4   ANSWER 4
<result>B</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 11. What is the last numbers?