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 ? February 2, 2024 – by admin 0A. 5B. 7C. 12D. 17A + B + C = 48B + C + D = 45A + D = 13A – D = 3A + D = 132D = 10D = 5