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 15. What is the last numbers?	Choose the correct option
A) 2	B) 4	C) 6	D) 5	E) 7
A + B + 6 = 48   B + 6 + D = 45   A + D = 13   A – D = 3   A + D = 15   2D = 12   D = 6   ANSWER 6
<result>C</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 15. What is the last numbers?