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 13. What is the last numbers?	Choose one: A) 5 B) 7 C) 8 D) 9 E) 12
Explanation:   5 + B + C = 48   B + C + D = 45   5 + D = 13   5 – D = 3   5 + D = 13   2D = 10   D = 5   5)
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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 13. What is the last numbers?