The average of 1st 3 of 4 numbers is 6 and of the last 3 are 5. If the sum of the first and the last number is 13. What is the last numbers?	Choose the correct choice from the following answers:
A) 4	B) 5	C) 6	D) 7	E) 8
A + 5 + C = 18   5 + C + D = 15   A + D = 13   A – D = 3   A + D = 13   2D = 10   D = 5   ANSWER:5
<result>B</result>
The average of 1st 3 of 4 numbers is 6 and of the last 3 are 5. If the sum of the first and the last number is 13. What is the last numbers?